[2010-04-16 23:31:34 - MobileDataKeeper] Error in an XML file: aborting build. [2010-04-16 23:31:57 - MobileDataKeeper] Error in an XML file: aborting build. [2010-04-16
This was killing me. Heres a fix that does not require you to switch editors:
Eclipse -> Window -> Preferences -> Run/Debug -> Launching -> Launch Operation -> Always Launch the previously launched application
Of course delete the xml out files that were created as suggested, and make sure you have at least run the correct configuration at least once.