Thanks for the response.
I had previously problems I think twice with 1.x versions that eventually Andrew got the hold of and fixed (apparently not common errors), but haven’t had a problem since.
I tried the first 2.x version that came out public and had the same problem that it didn’t start (neither create the Rack folder, I already had ereased the one from the 1x version)
Because of good practice (?) I formated my computer and installed the OS from scratch, and the first thing I did was trying to run Rack 2 and from that is the error I posted.
I’ll submit to the Support section.