How do I fix value cannot be null Parameter name: typeName when opening XAML file?

Question

We are using Silverlight 4 (we must use it. :p ) with VS2010. AFAIK we have the proper toolkits and SDKs installed.

When we try to open a XAML file, we are immediately presented with an error dialog that says: "Value cannot be null. Parameter name: typeName". The designer does not load. There is no output in the output window, there are no build errors.

We are at a complete loss on what to do.

This does only affect some of our workstations. We are in a controlled enviorment and reinstalling VS2010 is not really an option. Again :p

Thanks!

Answer 1

I've had similar dialog boxes pop up when I have had reference issues in the xaml but not with that exact text. I would verify that all the refferences are in the correct location and that they are the correct version.