Install failed System.IO.FileNotFoundException WIN 10

[core]

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Initialization of CONFIG Prefs Failed
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Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at http://www.telerik.com/forums/fiddler.

Could not load file or assembly 'System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

Type: System.IO.FileNotFoundException
Source: Fiddler
   at Fiddler.PreferenceBag..ctor(String sRegPath)

   at Fiddler.CONFIG.() in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Application\Config.cs:line 1956

   at Fiddler.CONFIG..cctor() in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Application\Config.cs:line 1935


Fiddler v5.0.20173.50948 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.14393.0] 
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OK   
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[Alexander]

Hello,

This is very weird error. System.Core is part of the .NET Framework and such exceptions may indicate corrupted installation of the framework. You can try repairing/reinstalling the .NET Framework using the appropriate installer from Microsoft's website.

Regards,
Alexander
Progress Telerik

[Med]

Hi there. I have almost the same problem. Screenshot is attached.

Win 7 SP1.

Appreciate any help.

Thank you

[Alexander]

Hi,

It seems that Fiddler's installation is corrupted. Would you mind trying reinstallation of Fiddler?

Regards,
Alexander
Progress Telerik

[Med]

Thanks for you reply, Alexander.

I have found the problem. It was CIS (Comodo Internet Security) not giving the app full permissions as it was supposed to. I have now made sure Fiddler.exe has all the permissions it needs in CIS and everything appears to be working as it should.

 

Sorry for the waste of your time. Perhaps this may help someone in the future.

 

Regards

Med

[Alexander]

Hello,

Glad you worked it out. And yes, it could help someone in the future, so thank you for sharing the solution.

Regards,
Alexander
Progress Telerik