ok that's ok then. this was the school system. so I can't really reinstall it. I'll try and use a cluster. Hopefully, it works. thanks a lot Chinnu -- View this message in context: http://gromacs.5086.x6.nabble.com/error-with-g-dist-tp5010736p5010751.html Sent from the GROMACS Users Forum mailing list archive at Nabble.com.