Cannot process request because the process (3880) has exited.

Hi. When I try to start a package manually clicking the Start Debugging button I get this after a little while:

Cannot process request because the process (3880) has exited. (Microsoft.DataTransformationServices.VsIntegration)

How can I prevent this from happening? This happens every time I want to start the package and

every time the process id is different. Here it is 3880.

Darek