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Error at startup. - Loading custom MIME mappings failed

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This is a migrated thread and some comments may be shown as answers.
Johnny
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Johnny asked on 19 Feb 2020, 07:51 AM
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Loading custom MIME mappings 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 cloud file provider is not running.



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

   at System.IO.FileStream.ReadCore(Byte[] buffer, Int32 offset, Int32 count)

   at System.IO.FileStream.Read(Byte[] array, Int32 offset, Int32 count)

   at System.Xml.XmlTextReaderImpl.InitStreamInput(Uri baseUri, String baseUriStr, Stream stream, Byte[] bytes, Int32 byteCount, Encoding encoding)

   at System.Xml.XmlTextReaderImpl..ctor(String url, Stream input, XmlNameTable nt)

   at System.Xml.Serialization.XmlSerializer.Deserialize(Stream stream)

   at Fiddler.XmlFileMimeMappings..ctor(String filePath) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\MimeMapping\XmlFileMimeMappings.cs:line 40

   at Fiddler.frmViewer.š(Object , EventArgs ) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Viewer.cs:line 9784


Fiddler v5.0.20194.41348 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.18362.0] 
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OK   
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Eric R | Senior Technical Support Engineer
Telerik team
answered on 21 Feb 2020, 02:24 PM

Hi Johnny,

Can you confirm that the file %USERPROFILE%\Documents\Fiddler2\CustomMimeMappings.xml exists? Additionally, is this stored on disk or on OneDrive? 

In the meantime, please let me know if you need any additional information. Thank you and I look forward to your reply.

Regards,


Eric R | Senior Technical Support Engineer
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Eric R | Senior Technical Support Engineer
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