Assembly rename problem in silverligh

Hi All,

I have rename my project assembly name to give more meaningfull, but when i run the application i am geeting a error called. 

Line: 57
Error: Unhandled Error in Silverlight Application 
Code: 2103    
Category: InitializeError       
Message: Invalid or malformed application: Check manifest     

Can anyone please tell me whether i am doing any mistake in changing of assembly name.

i rename the assembly on property window of Silverlight application.

Thanks in advance.