Error on startup - The tag present in the reparse point buffer is invalid.

[Derek]

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Folder Creation 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.

The tag present in the reparse point buffer is invalid.



Type: System.IO.IOException
Source: mscorlib
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.Directory.InternalCreateDirectory(String fullPath, String path, Object dirSecurityObj, Boolean checkHost)

   at System.IO.Directory.InternalCreateDirectoryHelper(String path, Boolean checkHost)

   at Fiddler.CONFIG.() in C:\Jenkins\Fiddler_Windows\workspace\FiddlerCore\FiddlerCore.Shared\Common\Application\Config.cs:line 1825


Fiddler v5.0.20204.45441 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.19043.0] 
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OK   
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[Nick Iliev]

This specific error is often seen when a folder connected with OneDrive is being accessed (or a new OneDrive folder is being created). Are you by chance trying to install/run Fiddler from a OneDrive shared folder? If this is the case, you could try the solution suggested in the following thread:

https://www.itexperience.net/fix-onedrive-the-tag-present-in-the-reparse-point-buffer-is-invalid/