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Silverlight4 - Unhandled Exception in the XAML Designer

Silverlight4 - Unhandled Exception in the XAML Designer

(OP)
I'm getting an unhandled exception error for the designer when starting a NEW Silverlight application:

System.NullReferenceException
Object reference not set to an instance of an object.
at Microsoft.Windows.Design.Platform.SilverlightMetadataContext.SilverlightXamlExtensionImplementations.<GetXmlNamespaceCompatibilityMappings>d__8.MoveNext() etc...

I read online where prior Silverlight installs could muck things up, so I uninstalled all silverlight and loaded the Silverlight 4 SDK for VS210 (The VS version I'm using.) I only have Silverlight4 installed. Not 3.

Worked great! I continued on.

Now when I restarted VS today I have the unhandled exception error again for the designer. I only have a textbox and button on the form and in the XAML. I can't find the resolution for this. I've even reinstalled the Silverlight4 SDK. Didn't help.

Even when I start a NEW application - it gives me the designer error right off the bat.

Any help would be appreciated. smile

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