Services cannot be enabled for a project that does not have the Mobile Project Nature assigned.
This occurs mainly when importing a project from Git where the .project file is not included. To simulate this do the following:
1. Right click on a project that does not have services enabled and go to Properties.
2. Selet Project Natures
3. Uncheck Mobile
Steps to reproduce:
1. Open up the tiapp.xml from the project modified above
2. Click on enable services
3. Notice that a progress bar appears and things seem to download
4. Notice that services are not enabled and the tiapp.xml is not correctly modified.