New mobile application - can't logon

I'm running Mobile Sales 5.0 SP06. In Mobile Application Studio I create a new project ( BOL + UI ). I generate all the items, and build the project. After that I try to logon to the application and it fails.

The error is that it can't generate the logon object......is there any further step (like registering a dll or something) that needs to be done? My custom application is an exact copy of the MSA.

Thanks