Silverlight application doesn't run. I get an invalid or malformed application error

Question

I have a Silverlight application, and when I click 'run' Internet Explorer starts up and nothing is shown. I get an error icon in the bottom left that, when I click it, result in the following error.

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0) Timestamp: Wed, 25 Nov 2009 00:11:41 UTC

Message: Unhandled Error in Silverlight Application

Code: 2103

Category: InitializeError

Message: Invalid or malformed application: Check manifest

Line: 54 Char: 13 Code: 0 URI: http://localhost:50511/TestPage.html

Why do I get this error? And how can I fix it?

I have looked around and other people seemed to get this error when they renamed their application, however I haven't done this.

I have created a custom style, if that might have anything to do with it.

I have done no coding, all I have done is dragging on my style's controls and linked the pages.

Answer 1

I've had this error in a few circumstances. Check that the Startup Object in the properties is correct (any namespace changes?). Be sure to explicitly add your Silverlight project as a dependent project for your web project, this is not done by default.

Re-add your Silverlight project under the Silverlight Applications in the web project's properties. Make sure that the App.xaml x:Class matches the code behind namespace and class name. Hmm, I think those are the usual tricks.

I hope this helps.