Fiddler Crashes on Startup

[Alexey]

For a few months now on my Windows 10 machine I can't start Fiddler successfully.

Here's what I get in the Event logs:

Log Name:      Application
Source:        Application Error
Date:          30.01.2018 11:05:37
Event ID:      1000
Task Category: (100)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      ****
Description:
Faulting application name: Fiddler.exe, version: 4.6.3.50306, time stamp: 0x584b0128
Faulting module name: KERNELBASE.dll, version: 10.0.16299.15, time stamp: 0x4736733c
Exception code: 0xe0434352
Fault offset: 0x0000000000013fb8
Faulting process id: 0x10b98
Faulting application start time: 0x01d399a11c497360
Faulting application path: C:\Program Files (x86)\Fiddler2\Fiddler.exe
Faulting module path: C:\WINDOWS\System32\KERNELBASE.dll
Report Id: 021dcf44-7589-4944-a00d-8f3eb1243ed8
Faulting package full name: 
Faulting package-relative application ID: 
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Error" />
    <EventID Qualifiers="0">1000</EventID>
    <Level>2</Level>
    <Task>100</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2018-01-30T08:05:37.110892600Z" />
    <EventRecordID>93659</EventRecordID>
    <Channel>Application</Channel>
    <Computer>****</Computer>
    <Security />
  </System>
  <EventData>
    <Data>Fiddler.exe</Data>
    <Data>4.6.3.50306</Data>
    <Data>584b0128</Data>
    <Data>KERNELBASE.dll</Data>
    <Data>10.0.16299.15</Data>
    <Data>4736733c</Data>
    <Data>e0434352</Data>
    <Data>0000000000013fb8</Data>
    <Data>10b98</Data>
    <Data>01d399a11c497360</Data>
    <Data>C:\Program Files (x86)\Fiddler2\Fiddler.exe</Data>
    <Data>C:\WINDOWS\System32\KERNELBASE.dll</Data>
    <Data>021dcf44-7589-4944-a00d-8f3eb1243ed8</Data>
    <Data>
    </Data>
    <Data>
    </Data>
  </EventData>
</Event>


Log Name:      Application
Source:        .NET Runtime
Date:          30.01.2018 11:05:36
Event ID:      1026
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      ****
Description:
Application: Fiddler.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.FileNotFoundException
   at Fiddler.FiddlerApplication..cctor()


Exception Info: System.TypeInitializationException
   at Fiddler.FiddlerApplication.ReportException(System.Exception, System.String)
   at Fiddler.CONFIG..cctor()


Exception Info: System.TypeInitializationException
   at Fiddler.frmViewer.•(System.Object, System.UnhandledExceptionEventArgs)




Event Xml:
<Event xmlns='http://schemas.microsoft.com/win/2004/08/events/event'><System><Provider Name='.NET Runtime'/><EventID Qualifiers='0'>1026</EventID><Level>2</Level><Task>0</Task><Keywords>0x80000000000000</Keywords><TimeCreated SystemTime='2018-01-30T08:05:36.981296100Z'/><EventRecordID>93658</EventRecordID><Channel>Application</Channel><Computer>****</Computer><Security/></System><EventData><Data>Application: Fiddler.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.FileNotFoundException
   at Fiddler.FiddlerApplication..cctor()


Exception Info: System.TypeInitializationException
   at Fiddler.FiddlerApplication.ReportException(System.Exception, System.String)
   at Fiddler.CONFIG..cctor()


Exception Info: System.TypeInitializationException
   at Fiddler.frmViewer.•(System.Object, System.UnhandledExceptionEventArgs)


</Data></EventData></Event>

[Alexander]

Hi,

From the log I can see that you are using very old version of Fiddler. Please, update to the latest version and try running it again.

Regards,
Alexander
Progress Telerik

[Alexey]

I downloaded the installer on Jan 30th and it's anyone's guess how this could be an old version. Removed and reinstalled it, still no luck. Where does it show the old version? Which is the current version that should work?

Here?

Faulting application name: Fiddler.exe, version: 4.6.3.50306, time stamp: 0x584b0128
Faulting module name: KERNELBASE.dll, version: 10.0.16299.15, time stamp: 0x4736733c

[Alexey]

Same with a fresh installer dated TODAY

Faulting application name: Fiddler.exe, version: 4.6.3.50306, time stamp: 0x584b0128
Faulting module name: KERNELBASE.dll, version: 10.0.16299.15, time stamp: 0x4736733c
Exception code: 0xe0434352
Fault offset: 0x0000000000013fb8
Faulting process id: 0x2f14
Faulting application start time: 0x01d39e63d43619ed
Faulting application path: C:\Program Files (x86)\Fiddler2\Fiddler.exe
Faulting module path: C:\WINDOWS\System32\KERNELBASE.dll
Report Id: 9e2e4abf-ed73-4255-b58b-e4e778ce71cd
Faulting package full name: 
Faulting package-relative application ID: 

Application: Fiddler.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.FileNotFoundException
   at Fiddler.FiddlerApplication..cctor()

Exception Info: System.TypeInitializationException
   at Fiddler.FiddlerApplication.ReportException(System.Exception, System.String)
   at Fiddler.CONFIG..cctor()

Exception Info: System.TypeInitializationException
   at Fiddler.frmViewer.•(System.Object, System.UnhandledExceptionEventArgs)

[Alexander]

Hello,

Would it be possible to share the contents of "C:\Program Files (x86)\Fiddler2" and "%LOCALAPPDATA%\Programs\Fiddler"?

Regards,
Alexander
Progress Telerik

[Alexey]

Perhaps. Where to?

[Simeon]

Hello,

Attaching a screenshots or a text files with the contents of the folders would suffice.

Regards,
Simeon
Progress Telerik

[Alexey]

Will a list of files be helpful? just change the file extension to txt (allowed: .jpg, .jpeg, .gif, .png)

[Alexander]

Hello,

Something seems to went wrong during the installation process. The steps to fix it are:

1. Uninstall Fiddler though "Apps and Features".
2. Go to "C:\Program Files (x86)" and delete the "Fiddler2" folder.
3. Go to "%LOCALAPPDATA%\Programs" and delete the "Fiddler" folder.
4. Install the newest version of Fiddler.

This should fix the problem.

Regards,
Alexander
Progress Telerik

[Alexey]

Sorry, doesn't help

[Simeon]

Hi,

The newest version of Fiddler installs into %LOCALAPPDATA%\Programs\Fiddler folder by default and not into C:\Program Files (x86)\Fiddler2 anymore. It seems that for some reason the old version of Fiddler is being run:

Same with a fresh installer dated TODAY

Faulting application name: Fiddler.exe, version: 4.6.3.50306, time stamp: 0x584b0128
Faulting module name: KERNELBASE.dll, version: 10.0.16299.15, time stamp: 0x4736733c
Exception code: 0xe0434352
Fault offset: 0x0000000000013fb8
Faulting process id: 0x2f14
Faulting application start time: 0x01d39e63d43619ed
Faulting application path: C:\Program Files (x86)\Fiddler2\Fiddler.exe
Faulting module path: C:\WINDOWS\System32\KERNELBASE.dll
Report Id: 9e2e4abf-ed73-4255-b58b-e4e778ce71cd
Faulting package full name: 
Faulting package-relative application ID: 

Application: Fiddler.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.FileNotFoundException
   at Fiddler.FiddlerApplication..cctor()

Exception Info: System.TypeInitializationException
   at Fiddler.FiddlerApplication.ReportException(System.Exception, System.String)
   at Fiddler.CONFIG..cctor()

Exception Info: System.TypeInitializationException
   at Fiddler.frmViewer.•(System.Object, System.UnhandledExceptionEventArgs)

Could you, please, go to %LOCALAPPDATA%\Programs\Fiddler and run the Fiddler.exe

Regards,
Simeon
Progress Telerik