Hi, Thanks but the with AMBER its working. If it had been the problem of cluster. It should be with AMBER too. Regards Syed Tarique Moin -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://maillist.sys.kth.se/pipermail/gromacs.org_gmx-users/attachments/20100630/6b4a865c/attachment.html>