Not able to open fiddler on mac

[Shrimpy]

when run "mono Fiddler.exe", i am getting below error, any idea?

WARNING: The Carbon driver has not been ported to 64bits, and very few parts of Windows.Forms will work properly, or at all
exception inside UnhandledException handler: The type initializer for 'Fiddler.CONFIG' threw an exception.


[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: The type initializer for 'System.Windows.Forms.WindowsFormsSynchronizationContext' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Windows.Forms.ThemeEngine' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Windows.Forms.ThemeWin32Classic' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Drawing.KnownColors' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Drawing.GDIPlus' threw an exception. ---> System.DllNotFoundException: libgdiplus.dylib
  at (wrapper managed-to-native) System.Drawing.GDIPlus:GdiplusStartup (ulong&,System.Drawing.GdiplusStartupInput&,System.Drawing.GdiplusStartupOutput&)
  at System.Drawing.GDIPlus..cctor () <0x109dba840 + 0x001d5> in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Drawing.KnownColors..cctor () <0x109dba5a0 + 0x00064> in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Drawing.Color.get_Black () <0x10a8ca4e0 + 0x0001e> in <filename unknown>:0 
  at System.Windows.Forms.ThemeWin32Classic..cctor () <0x10a8ca3d0 + 0x00015> in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Windows.Forms.ThemeVisualStyles..ctor () <0x10a8ca2f0 + 0x00014> in <filename unknown>:0 
  at System.Windows.Forms.ThemeEngine..cctor () <0x10a8ca1d0 + 0x0008f> in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Windows.Forms.SystemInformation.get_MenuAccessKeysUnderlined () <0x10a8c9da0 + 0x00010> in <filename unknown>:0 
  at System.Windows.Forms.Control..ctor () <0x10a8c86e0 + 0x00288> in <filename unknown>:0 
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control:.ctor ()
  at System.Windows.Forms.WindowsFormsSynchronizationContext..cctor () <0x10a8c9c90 + 0x00031> in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Windows.Forms.Control..ctor () <0x10a8c86e0 + 0x0005e> in <filename unknown>:0 
  at System.Windows.Forms.ScrollableControl..ctor () <0x10a8c8080 + 0x00017> in <filename unknown>:0 
  at System.Windows.Forms.ContainerControl..ctor () <0x10a8c7ea0 + 0x0002d> in <filename unknown>:0 
  at System.Windows.Forms.Form..ctor () <0x10a8c7510 + 0x000f9> in <filename unknown>:0 
  at ...ctor () <0x10a8c5080 + 0x0002d> in <filename unknown>:0 
  at (wrapper remoting-invoke-with-check) .:.ctor ()
  at Fiddler.frmViewer.‹• (System.String[] ˆ•) <0x109db3870 + 0x00136> in <filename unknown>:0 
  at Fiddler.frmViewer.‡• (System.String[] ˆ•) <0x109db2da0 + 0x0009b> in <filename unknown>:0 

 

 

[Tsviatko Yovtchev]

Hello,

It looks like you have a custom built 64-bit Mono version. Is that the case? Mono still doesn't offer support for WinForms in their 64-bit implementation and that is why you get this exception. You will have to switch to 32-bit mono to run Fiddler.

Regards,
Tsviatko Yovtchev
Telerik by Progress

[阿斌]

And if you mono has installed with Homebrew, if will not switch to 32-bit. So you should reinstall mono from the official website

[Greg]

I don't see where Mono has a 32-bit separate install.  Their installer is universal so it detects 64-bit system automatically.  Would moving to .NET core address this?

http://www.mono-project.com/download/#download-mac

I miss Fiddler :(

[Alexander]

Hi Greg,

You are right - there is no installer for 32-bit version of Mono. But there seems to be a switch, which can be used to run an assembly on the 32-bit Mono VM. You can find more information here.

Regards,
Alexander
Progress Telerik

[Andrew]

Hi Alexander,

Can you give specifics on how to change mono from 64 bit to 32 bit?  The steps were not clear in the link you provided.  I am very new to MAC's and using this MAC, including the steps of installing mono to use Fiddler for my testing has been a google search.  By new, I am learning how to navigate Finder and just started with the Terminal today and Fiddler is my 3rd program manually installed.  Any extra help is appreciated. 

Cheers,

Andy 

[Andrew]

Alexander,

I typed in "mono --arch=32" in a terminal.  When I do I get a list of commands.  

Andrews-MBP-2:fiddler-mac searsa$ mono --arch=32
Usage is: mono [options] program [program-options]


Development:
    --aot[=<options>]      Compiles the assembly to native code
    --debug[=<options>]    Enable debugging support, use --help-debug for details
    --debugger-agent=options Enable the debugger agent
    --profile[=profiler]   Runs in profiling mode with the specified profiler module
    --trace[=EXPR]         Enable tracing, use --help-trace for details
    --jitmap               Output a jit method map to /tmp/perf-PID.map
    --help-devel           Shows more options available to developers


Runtime:
    --config FILE          Loads FILE as the Mono config
    --verbose, -v          Increases the verbosity level
    --help, -h             Show usage information
    --version, -V          Show version information
    --runtime=VERSION      Use the VERSION runtime, instead of autodetecting
    --optimize=OPT         Turns on or off a specific optimization
                           Use --list-opt to get a list of optimizations
    --security[=mode]      Turns on the unsupported security manager (off by default)
                           mode is one of cas, core-clr, verifiable or validil
    --attach=OPTIONS       Pass OPTIONS to the attach agent in the runtime.
                           Currently the only supported option is 'disable'.
    --llvm, --nollvm       Controls whenever the runtime uses LLVM to compile code.
    --gc=[sgen,boehm]      Select SGen or Boehm GC (runs mono or mono-sgen)
    --arch=[32,64]         Select architecture (runs mono32 or mono64)
    --handlers             Install custom handlers, use --help-handlers for details.
    --aot-path=PATH        List of additional directories to search for AOT images.

 

[Alexander]

Hi Andrew,

The command you should use is

mono --arch=32 Fiddler.exe

This will run Fiddler in a 32-bit Mono.

Regards,
Alexander
Progress Telerik

[Chu]

When I tried to switch to mono32, it failed too:

$ mono --arch=32
Error: --arch=32 Failed to switch to 'mono32'.

[qingqing]

I also encountered the same problem. How can I solve it

[Nick Iliev]

Hey qingqing,

The above command tells the mono to run the application as a 32-bit app, while the modern macOS versions no longer support 32-bit architecture. That said, the Fiddler Mono builds are no longer officially supported, but you could try Fiddler Everywhere, which comes with official support for macOS, WIndows, and Linux distributions.

[双双]

i think mono fiddler.exe --arch=32

[双双]

mono --arch=32 Fiddler.exe , it works

[zhao]

mono --arch=32 Fiddler.exe

[Jeff]

I had some troubles so did a walk through and posted it here.  I ran in to the ARCH issue and accepting the eula for Mono: https://blogs.msdn.microsoft.com/jpsanders/2018/02/08/usinginstalling-fiddler-on-mac-os/

 

 

[Andrey]

mono32  ...way

[Anil V K]

Hi,

 

Tried everything mentioned but still ran out of options !!!

 

GSBNG-C02VV0DTG8WN:~ avkbabu$ mono /Users/avkbabu/Documents/fiddler-mac/fiddler.exe
WARNING: The Carbon driver has not been ported to 64bits, and very few parts of Windows.Forms will work properly, or at all
Fontconfig warning: ignoring UTF-8: not a valid region tag
Fontconfig warning: ignoring UTF-8: not a valid region tag
Fontconfig warning: ignoring UTF-8: not a valid region tag
Fontconfig warning: ignoring UTF-8: not a valid region tag
Fontconfig warning: ignoring UTF-8: not a valid region tag
Fontconfig warning: ignoring UTF-8: not a valid region tag
Fontconfig warning: ignoring UTF-8: not a valid region tag
Stacktrace:


  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) System.Windows.Forms.XplatUICarbon.CGDisplayBounds (intptr) [0x00002] in <1141838629e74c21a3b96d0a06337bad>:0
  at System.Windows.Forms.XplatUICarbon.get_WorkingArea () [0x00005] in <1141838629e74c21a3b96d0a06337bad>:0
  at System.Windows.Forms.XplatUICarbon.get_VirtualScreen () [0x00000] in <1141838629e74c21a3b96d0a06337bad>:0
  at System.Windows.Forms.XplatUI.get_VirtualScreen () [0x00000] in <1141838629e74c21a3b96d0a06337bad>:0
  at System.Windows.Forms.Screen..cctor () [0x00034] in <1141838629e74c21a3b96d0a06337bad>:0
  at (wrapper runtime-invoke) object.runtime_invoke_void (object,intptr,intptr,intptr) [0x0001e] in <ede5cf6930dc4b9a8366f15f6c89bbd0>:0
  at <unknown> <0xffffffff>
  at System.Windows.Forms.Form.get_CreateParams () [0x00157] in <1141838629e74c21a3b96d0a06337bad>:0
  at System.Windows.Forms.Control.CreateHandle () [0x0002a] in <1141838629e74c21a3b96d0a06337bad>:0
  at System.Windows.Forms.Form.CreateHandle () [0x00000] in <1141838629e74c21a3b96d0a06337bad>:0
  at System.Windows.Forms.Control.CreateControl () [0x00039] in <1141838629e74c21a3b96d0a06337bad>:0
  at System.Windows.Forms.Control.SetVisibleCore (bool) [0x0003a] in <1141838629e74c21a3b96d0a06337bad>:0
  at System.Windows.Forms.Form.SetVisibleCore (bool) [0x00065] in <1141838629e74c21a3b96d0a06337bad>:0
  at System.Windows.Forms.Control.set_Visible (bool) [0x00009] in <1141838629e74c21a3b96d0a06337bad>:0
  at System.Windows.Forms.Control.Show () [0x00000] in <1141838629e74c21a3b96d0a06337bad>:0
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control.Show () [0x00031] in <1141838629e74c21a3b96d0a06337bad>:0
  at Fiddler.frmViewer.‹• (string[]) [0x00081] in <09623c708fdb40a483cea147bbea7a7f>:0
  at Fiddler.frmViewer.‡• (string[]) [0x00016] in <09623c708fdb40a483cea147bbea7a7f>:0
  at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) [0x0004e] in <09623c708fdb40a483cea147bbea7a7f>:0


Native stacktrace:


0   mono                                0x000000010bb4cc01 mono_handle_native_crash + 257
1   mono                                0x000000010bbb7236 altstack_handle_and_restore + 70
2   SkyLight                            0x00007fff6aa42fa8 SLDisplayBounds + 83
3   ???                                 0x0000000112cd08de 0x0 + 4610394334
4   ???                                 0x000000010c522486 0x0 + 4501677190
5   mono                                0x000000010baa34c7 mono_jit_runtime_invoke + 1383
6   mono                                0x000000010bc63ed4 do_runtime_invoke + 84
7   mono                                0x000000010bc60024 mono_runtime_class_init_full + 996
8   mono                                0x000000010ba9c7ce mono_jit_compile_method_inner + 2478
9   mono                                0x000000010ba9f683 mono_jit_compile_method_with_opt + 1363
10  mono                                0x000000010bb4f0c1 common_call_trampoline + 1217
11  mono                                0x000000010bb4ebbc mono_magic_trampoline + 60
12  ???                                 0x000000010bf6639e 0x0 + 4495664030
13  ???                                 0x000000010edf2b4b 0x0 + 4544473931
14  ???                                 0x000000010c7fbb7f 0x0 + 4504664959
15  ???                                 0x000000010c7fb7f7 0x0 + 4504664055
16  ???                                 0x000000010c522043 0x0 + 4501676099
17  mono                                0x000000010baa34c7 mono_jit_runtime_invoke + 1383
18  mono                                0x000000010bc63ed4 do_runtime_invoke + 84
19  mono                                0x000000010bc674f9 do_exec_main_checked + 137
20  mono                                0x000000010bb104bf mono_jit_exec + 287
21  mono                                0x000000010bb12cb4 mono_main + 9140
22  mono                                0x000000010ba92e8d main + 253
23  mono                                0x000000010ba92d84 start + 52
24  ???                                 0x0000000000000002 0x0 + 2


Debug info from gdb:


(lldb) command source -s 0 '/tmp/mono-gdb-commands.HaOWSg'
Executing commands in '/tmp/mono-gdb-commands.HaOWSg'.
(lldb) process attach --pid 30527
warning: (x86_64) /Library/Frameworks/Mono.framework/Versions/5.8.0/lib/mono/4.5/mscorlib.dll.dylib empty dSYM file detected, dSYM was created with an executable with no debug info.
warning: (x86_64) /Library/Frameworks/Mono.framework/Versions/5.8.0/lib/libglib-2.0.0.dylib empty dSYM file detected, dSYM was created with an executable with no debug info.
Process 30527 stopped
* thread #1, name = 'tid_307', queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
    frame #0: 0x00007fff709e3502 libsystem_kernel.dylib`__wait4 + 10
libsystem_kernel.dylib`__wait4:
->  0x7fff709e3502 <+10>: jae    0x7fff709e350c            ; <+20>
    0x7fff709e3504 <+12>: movq   %rax, %rdi
    0x7fff709e3507 <+15>: jmp    0x7fff709da0dd            ; cerror
    0x7fff709e350c <+20>: retq   
Target 0: (mono) stopped.


Executable module set to "/Library/Frameworks/Mono.framework/Home/bin/mono".
Architecture set to: x86_64h-apple-macosx.
(lldb) thread list
Process 30527 stopped
* thread #1: tid = 0x2a6e13, 0x00007fff709e3502 libsystem_kernel.dylib`__wait4 + 10, name = 'tid_307', queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  thread #2: tid = 0x2a6e18, 0x00007fff709e2cee libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'SGen worker'
  thread #3: tid = 0x2a6e1b, 0x00007fff709d97fe libsystem_kernel.dylib`semaphore_wait_trap + 10, name = 'Finalizer'
  thread #4: tid = 0x2a6e1c, 0x00007fff709e3562 libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #5: tid = 0x2a6e1d, 0x00007fff709e3562 libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #6: tid = 0x2a6e32, 0x00007fff709e3562 libsystem_kernel.dylib`__workq_kernreturn + 10
  thread #7: tid = 0x2a6e41, 0x00007fff709e2cee libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'Timer-Scheduler'
(lldb) thread backtrace all
* thread #1, name = 'tid_307', queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  * frame #0: 0x00007fff709e3502 libsystem_kernel.dylib`__wait4 + 10
    frame #1: 0x000000010bb4cc8e mono`mono_handle_native_crash(signal=<unavailable>, ctx=<unavailable>, info=<unavailable>) at mini-exceptions.c:2731 [opt]
    frame #2: 0x000000010bbb7236 mono`altstack_handle_and_restore(ctx=0x00007ffee416e490, obj=0x0000000000000000, stack_ovf=0) at exceptions-amd64.c:856 [opt]
    frame #3: 0x00007fff6aa42fa8 SkyLight`SLDisplayBounds + 83
    frame #4: 0x0000000112cd08de
    frame #5: 0x000000010c522486
    frame #6: 0x000000010baa34c7 mono`mono_jit_runtime_invoke(method=<unavailable>, obj=<unavailable>, params=0x0000000000000000, exc=0x0000000112cd0260, error=<unavailable>) at mini-runtime.c:2800 [opt]
    frame #7: 0x000000010bc63ed4 mono`do_runtime_invoke(method=0x00007f81d40cf748, obj=0x0000000000000000, params=0x0000000000000000, exc=0x00007ffee416eb88, error=0x00007ffee416ed60) at object.c:2849 [opt]
    frame #8: 0x000000010bc60024 mono`mono_runtime_class_init_full [inlined] mono_runtime_try_invoke(method=<unavailable>, obj=<unavailable>, params=<unavailable>, error=0x00007ffee416ed60) at object.c:2956 [opt]
    frame #9: 0x000000010bc5ffdf mono`mono_runtime_class_init_full(vtable=0x00007f81d413bbf0, error=0x00007ffee416ed60) at object.c:473 [opt]
    frame #10: 0x000000010ba9c7ce mono`mono_jit_compile_method_inner(method=0x00007f81d40cf5d0, target_domain=<unavailable>, opt=<unavailable>, error=0x00007ffee416ed60) at mini.c:4343 [opt]
    frame #11: 0x000000010ba9f683 mono`mono_jit_compile_method_with_opt(method=0x00007f81d40cf5d0, opt=<unavailable>, jit_only=0, error=<unavailable>) at mini-runtime.c:2129 [opt]
    frame #12: 0x000000010bb4f0c1 mono`common_call_trampoline(regs=0x00007ffee416ee28, code="H\x8b?H??\xa8H\x8b??8, m=0x00007f81d40cf5d0, vt=<unavailable>, vtable_slot=<unavailable>, error=<unavailable>) at mini-trampolines.c:715 [opt]
    frame #13: 0x000000010bb4ebbc mono`mono_magic_trampoline(regs=0x00007ffee416ee28, code="H\x8b?H??\xa8H\x8b??8, arg=0x00007f81d40cf5d0, tramp=<unavailable>) at mini-trampolines.c:846 [opt]
    frame #14: 0x000000010bf6639e
    frame #15: 0x000000010edf2b4b
    frame #16: 0x000000010c7fbb7f
    frame #17: 0x000000010c7fb7f7
    frame #18: 0x000000010c522043
    frame #19: 0x000000010baa34c7 mono`mono_jit_runtime_invoke(method=<unavailable>, obj=<unavailable>, params=0x00007ffee416f698, exc=0x000000010c852548, error=<unavailable>) at mini-runtime.c:2800 [opt]
    frame #20: 0x000000010bc63ed4 mono`do_runtime_invoke(method=0x00007f81d2700528, obj=0x0000000000000000, params=0x00007ffee416f698, exc=0x0000000000000000, error=0x00007ffee416f6d8) at object.c:2849 [opt]
    frame #21: 0x000000010bc674f9 mono`do_exec_main_checked [inlined] mono_runtime_invoke_checked(method=<unavailable>, obj=<unavailable>, error=<unavailable>) at object.c:3002 [opt]
    frame #22: 0x000000010bc674b8 mono`do_exec_main_checked(method=0x00007f81d2700528, args=<unavailable>, error=0x00007ffee416f6d8) at object.c:4726 [opt]
    frame #23: 0x000000010bb104bf mono`mono_jit_exec(domain=<unavailable>, assembly=<unavailable>, argc=1, argv=0x00007ffee416f9f8) at driver.g.c:1040 [opt]
    frame #24: 0x000000010bb12cb4 mono`mono_main [inlined] main_thread_handler at driver.g.c:1109 [opt]
    frame #25: 0x000000010bb12c81 mono`mono_main(argc=2, argv=<unavailable>) at driver.g.c:2222 [opt]
    frame #26: 0x000000010ba92e8d mono`main [inlined] mono_main_with_options(argc=<unavailable>, argv=<unavailable>) at main.c:46 [opt]
    frame #27: 0x000000010ba92e79 mono`main(argc=2, argv=<unavailable>) at main.c:339 [opt]
    frame #28: 0x000000010ba92d84 mono`start + 52
  thread #2, name = 'SGen worker'
    frame #0: 0x00007fff709e2cee libsystem_kernel.dylib`__psynch_cvwait + 10
    frame #1: 0x00007fff70b1f662 libsystem_pthread.dylib`_pthread_cond_wait + 732
    frame #2: 0x000000010bd1cc9e mono`thread_func [inlined] mono_os_cond_wait(mutex=<unavailable>) at mono-os-mutex.h:173 [opt]
    frame #3: 0x000000010bd1cc8b mono`thread_func at sgen-thread-pool.c:165 [opt]
    frame #4: 0x000000010bd1cc7d mono`thread_func(data=0x0000000000000000) at sgen-thread-pool.c:196 [opt]
    frame #5: 0x00007fff70b1e6c1 libsystem_pthread.dylib`_pthread_body + 340
    frame #6: 0x00007fff70b1e56d libsystem_pthread.dylib`_pthread_start + 377
    frame #7: 0x00007fff70b1dc5d libsystem_pthread.dylib`thread_start + 13
  thread #3, name = 'Finalizer'
    frame #0: 0x00007fff709d97fe libsystem_kernel.dylib`semaphore_wait_trap + 10
    frame #1: 0x000000010bcc941c mono`finalizer_thread [inlined] mono_os_sem_wait(flags=MONO_SEM_FLAGS_ALERTABLE) at mono-os-semaphore.h:90 [opt]
    frame #2: 0x000000010bcc9411 mono`finalizer_thread at mono-coop-semaphore.h:43 [opt]
    frame #3: 0x000000010bcc9405 mono`finalizer_thread(unused=<unavailable>) at gc.c:866 [opt]
    frame #4: 0x000000010bc856d0 mono`start_wrapper [inlined] start_wrapper_internal at threads.c:1003 [opt]
    frame #5: 0x000000010bc85633 mono`start_wrapper(data=<unavailable>) at threads.c:1063 [opt]
    frame #6: 0x00007fff70b1e6c1 libsystem_pthread.dylib`_pthread_body + 340
    frame #7: 0x00007fff70b1e56d libsystem_pthread.dylib`_pthread_start + 377
    frame #8: 0x00007fff70b1dc5d libsystem_pthread.dylib`thread_start + 13
  thread #4
    frame #0: 0x00007fff70b1dc40 libsystem_pthread.dylib`start_wqthread
  thread #5
    frame #0: 0x00007fff709e3562 libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fff70b1e06a libsystem_pthread.dylib`_pthread_wqthread + 1035
    frame #2: 0x00007fff70b1dc4d libsystem_pthread.dylib`start_wqthread + 13
  thread #6
    frame #0: 0x00007fff709e3562 libsystem_kernel.dylib`__workq_kernreturn + 10
    frame #1: 0x00007fff70b1e26f libsystem_pthread.dylib`_pthread_wqthread + 1552
    frame #2: 0x00007fff70b1dc4d libsystem_pthread.dylib`start_wqthread + 13
  thread #7, name = 'Timer-Scheduler'
    frame #0: 0x00007fff709e2cee libsystem_kernel.dylib`__psynch_cvwait + 10
    frame #1: 0x00007fff70b1f69b libsystem_pthread.dylib`_pthread_cond_wait + 789
    frame #2: 0x000000010bd285d4 mono`mono_os_cond_timedwait(cond=0x00007f81d382b160, mutex=0x00007f81d382b120, timeout_ms=498) at mono-os-mutex.c:44 [opt]
    frame #3: 0x000000010bca6884 mono`mono_w32handle_timedwait_signal_handle [inlined] mono_w32handle_timedwait_signal_naked(cond=<unavailable>, mutex=<unavailable>, timeout=498, poll=0, alerted=<unavailable>) at w32handle.c:871 [opt]
    frame #4: 0x000000010bca687c mono`mono_w32handle_timedwait_signal_handle(handle=<unavailable>, timeout=<unavailable>, poll=0, alerted=<unavailable>) at w32handle.c:988 [opt]
    frame #5: 0x000000010bca66a0 mono`mono_w32handle_wait_one(handle=0x0000000000000002, timeout=498, alertable=<unavailable>) at w32handle.c:1109 [opt]
    frame #6: 0x000000010bca69b6 mono`mono_w32handle_wait_multiple(handles=<unavailable>, nhandles=<unavailable>, waitall=<unavailable>, timeout=<unavailable>, alertable=<unavailable>) at w32handle.c:1145 [opt]
    frame #7: 0x000000010bc80c64 mono`ves_icall_System_Threading_WaitHandle_Wait_internal(handles=<unavailable>, numhandles=<unavailable>, waitall=<unavailable>, timeout=-1, error=0x0000700007f817a8) at threads.c:1930 [opt]
    frame #8: 0x0000000112ccb9dd
    frame #9: 0x000000010de2edd0 mscorlib.dll.dylib`System_Threading_WaitHandle_InternalWaitOne_System_Runtime_InteropServices_SafeHandle_long_bool_bool + 64
    frame #10: 0x000000010de2ed7c mscorlib.dll.dylib`System_Threading_WaitHandle_WaitOne_long_bool + 44
    frame #11: 0x000000010de2ebe3 mscorlib.dll.dylib`System_Threading_WaitHandle_WaitOne_int_bool + 51
    frame #12: 0x000000010de2ed0c mscorlib.dll.dylib`System_Threading_WaitHandle_WaitOne_int + 28
    frame #13: 0x000000010de35cef mscorlib.dll.dylib`System_Threading_Timer_Scheduler_SchedulerThread + 2495
    frame #14: 0x000000010de27b77 mscorlib.dll.dylib`System_Threading_ThreadHelper_ThreadStart_Context_object + 151
    frame #15: 0x000000010de257b1 mscorlib.dll.dylib`System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object_bool + 33
    frame #16: 0x000000010de25740 mscorlib.dll.dylib`System_Threading_ExecutionContext_Run_System_Threading_ExecutionContext_System_Threading_ContextCallback_object + 80
    frame #17: 0x000000010de27cbf mscorlib.dll.dylib`System_Threading_ThreadHelper_ThreadStart + 47
    frame #18: 0x000000010c52dba9
    frame #19: 0x000000010baa34c7 mono`mono_jit_runtime_invoke(method=<unavailable>, obj=<unavailable>, params=0x0000700007f81ea8, exc=0x000000010c8517c8, error=<unavailable>) at mini-runtime.c:2800 [opt]
    frame #20: 0x000000010bc63ed4 mono`do_runtime_invoke(method=0x00007f81d30cbcb8, obj=0x000000010c851920, params=0x0000700007f81ea8, exc=0x0000000000000000, error=0x0000700007f81e40) at object.c:2849 [opt]
    frame #21: 0x000000010bc856fb mono`start_wrapper at threads.c:1011 [opt]
    frame #22: 0x000000010bc85633 mono`start_wrapper(data=<unavailable>) at threads.c:1063 [opt]
    frame #23: 0x00007fff70b1e6c1 libsystem_pthread.dylib`_pthread_body + 340
    frame #24: 0x00007fff70b1e56d libsystem_pthread.dylib`_pthread_start + 377
    frame #25: 0x00007fff70b1dc5d libsystem_pthread.dylib`thread_start + 13
(lldb) detach


=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries 
used by your application.
=================================================================


(lldb) quit
Process 30527 detached
Abort trap: 6

 

Just opens a blank file and nothing happens...

[Jeff]

Try this Nail: https://blogs.msdn.microsoft.com/jpsanders/2018/02/08/usinginstalling-fiddler-on-mac-os/

 

[Matt]

For others who may be having problems, this is what worked for me:

1. Install the cask instead of the brew:

brew cask install mono-mdk

2. Accept the xcodebuild EULA (not sure if this is necessary, but I did it so it's on here)

sudo xcodebuild -license

3. Use the --arch=32 option

mono --arch=32 Fiddler.exe

 

It took quite some time to come up initially, but subsequent starts are super quick.