When I want to debug a Mobile Application with Visual Studio 2008. It shows "Operation could not be completed" and do nothing more. After a little search, I noticed that the list of "Default output location on device" in Options > Tool > Device tools > Devices > Properties and this, for all the devices.
Does anyone know how to solve that problem? Thank you in advance.
The solution for me was to reinstall VS 2008. Please take a look at my comment below the root question.