Unable to find the report in the manifest resources. Please build the project, and try again

This error occurred to us when we were trying to run a crystal report in Silverlight 4.
The report was put in a folder with name 'MTS Reports'.
When the space in the folder name was removed and renamed as 'MTS_Reports' in the .cs file of the added crystal report and after we rebuilt the application, the error was resolved.

Hope This Helps.