Error: The Project Item 'DrawingIntegration' cannot be deployed through a Package

Jan 26 at 12:00 PM
Hi everyone,

I have an old SharePoint 2010 solution developed in Visual Studio 2010.

But when I try to build it with Visual Studio 2013 I got the following error:
The Project Item 'DrawingIntegration' cannot be deployed through a Package

'DrawingIntegration is a WCF service (svc file).

What can cause this problem?
I have CKS:Dev for VS 2013 installed.

Thanks in advance for any help.