Dear Sir,<br><br>I found an error which is given below as i run grompp for position-restraint <br><br>Fatal error:<br>Group DRG not found in indexfile.<br>Maybe you have non-default goups in your mdp file, while not using the '-n' option of grompp.<br>
In that case use the '-n' option.<br><br>The error was attempted with -n but the following error also found,<br><br>File input/output error:<br>index.ndx<br><br>I can do nothing by this simple statement, please help me, Sir<br>
<br>Regards with,<br><br>Ithayaraja M..<br>