yes, when creating the topology file i added atom O2 to the .rtp file when it said atom O2 is missing in atomstype
regards, ram -- View this message in context: http://gromacs.5086.n6.nabble.com/Fatal-error-Atomtype-O2-not-found-tp4998254p4998256.html Sent from the GROMACS Users Forum mailing list archive at Nabble.com. -- gmx-users mailing list gmx-users@gromacs.org http://lists.gromacs.org/mailman/listinfo/gmx-users Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/Search before posting! Please don't post (un)subscribe requests to the list. Use the www interface or send it to gmx-users-requ...@gromacs.org. Can't post? Read http://www.gromacs.org/Support/Mailing_Lists