I\'m trying to figure out this eclipse aptana plugin (coming from a visual studio background). When I try to debug my project as follows:
I was having the same problem as Mel Padden in osX. With the gem already installed it threw me the same error(I have rvm installed).What I did it was make a symbolic link to aptana and after that invoke it from console.
$ ln -s /Applications/Aptana\ Studio\ 3/AptanaStudio3.app/Contents/MacOS/AptanaStudio3 /usr/local/bin/aptana
$ aptana&
Is not the best solution, but it works :)