CRM webresource XAP problem

Hello world!

I have a problem with XAP in MS Dynamics CRM. Here are the steps I did. 

1. Created a project in Silerlight 4.0. Debug. It worked. Build.

2. In CRM created a web resource and attached from "ProjName\ProjName\ProjName\ProjName.Web\ClientBin" my xap file

3. In form inserted Web Resource

In the bottom of page there is error "Page error".

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thanks in advance
sincerely: Elya