Launching Python has encounterd a. Unable to get project for the run

I had the same problem with Aptana and just solved it. In my case I had configured another interpreter (IronPython) for running another script. When I got back to a previous script I got the same error message as you "Unable to get project for the run" because it was trying to run it with IronPython instead of Python.

I would therefore recommand the following:

1) Check your interpreter configuration. -> Window -> Preferences -> Pydev -> Interpreter Python

If you have no interpreter there try autoconfig. If it doesn't work you will have to browse it yourself by clicking New (then it should be somewhere like C:\Python27\python.exe)

2) If you have an interpreter, it means that Aptana is trying to run your script with another interpreter. In that case right click on your script file in Aptana -> Run as -> Python run.

That worked for me.

Good luck !