The information is not sufficient enough for us to determine what may cause the issue.
Could you please kindly attach a screenshot of the error to be investigated further?

thank you for answering.

Here there are 2 screenshots. in the first you can see a warning that "says" that some files are missing.

In the second you can see in the output panel that there is an error in ClientUI_Desktop_application.csproj

The file /Silverlight/v4.0/Microsoft.Silverlight.CSharp.targets is missing

Were can i find this file ??

thanks.

Hi i solved installing the new silverlight SDK toolkit for visual studio 2010.

thank you for your support.

Stefano.

Glad to hear the good news.

Should you need further assistance or run into any problems regarding our controls, feel free to post it into our forum. We would be happy to assist you again.