How can I fix a 2104 error in a Silverlight application

I have an existing Silverlight application that's been 开发者_开发技巧running for a few months with lots of users. This week we had a new user try to use the application but he keeps getting this error message.

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727) Timestamp: Wed, 24 Nov 2010 03:49:04 UTC

Message: Unhandled Error in Silverlight Application Code: 2104

Category: InitializeError

Message: 2104 An error has occurred.

We're running IIS 7.5 on Windows 2008 R2, the user has Silverlight 4 (4.0.50826.0) installed.

Any idea what might be wrong?

The error maybe due to MIME types. You will have to add the following MIME types:

• .xaml application/xaml+xml
• .xap application/x-silverlight-app
• .xbap application/x-ms-xbap