Dear As you said I change the name of the itp file to opls_xxx.
It works. thank you very much. But now i faced with new problem. I got new error: Fatal error: Incorrect number of parameters - found 4, expected 6 or 12. what does it mean? Thank you in advance Morteza _______________________________________________ gmx-users mailing list [email protected] http://www.gromacs.org/mailman/listinfo/gmx-users Please search the archive at http://www.gromacs.org/search before posting! Please don't post (un)subscribe requests to the list. Use the www interface or send it to [EMAIL PROTECTED] Can't post? Read http://www.gromacs.org/mailing_lists/users.php
