fiddler-docs/troubleshoot-fiddler/crashonstartup.md

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Fiddler exits unexpectedly on startup CrashOnStartup true 5

Fiddler Classic Crashes on Startup with an unhelpful message box

If you see this message box when starting Fiddler:

fiddlercrash

...it generally means that your .NET Framework installation is corrupt. If you uninstall and reinstall the .NET 2.0 Framework, the problem is usually resolved.