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Error when launching Fiddler 4

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Windows
This is a migrated thread and some comments may be shown as answers.
Jeff
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Jeff asked on 01 Oct 2020, 02:50 PM

I am receiving this error message upon launching Fiddler 4:

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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.

There is an error in XML document (0, 0).

Type: System.InvalidOperationException
Source: System.Xml
   at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)

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

   at Fiddler.XmlFileMimeMappings..ctor(String filePath) in C:\Jenkins\Fiddler_Windows\workspace\FiddlerCore\FiddlerCore.Shared\Common\Core\MimeMapping\XmlFileMimeMappings.cs:line 41

   at Fiddler.frmViewer.š(Object , EventArgs ) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Fiddler.Shared\Viewer.cs:line 9968

System.Xml.XmlException: Root element is missing.

   at System.Xml.XmlTextReaderImpl.Throw(Exception e)

   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()

   at System.Xml.XmlReader.MoveToContent()

   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderList1.Read3_ArrayOfMimeMap()
Fiddler v5.0.20202.18177 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.18363.0] 
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OK   
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Nick Iliev
Telerik team
answered on 06 Oct 2020, 07:26 AM

Hello Jeff,

 

Could you please try the solutions suggested in this forum thread and let us know if you were able to resolve the issue.

 

Regards,
Nick Iliev
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Nick Iliev
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