<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:24pt"><div><font size="4">Dear gmx users,</font></div><div><font size="4"><br></font></div><div><font size="4">I'm going to simulate the POPC in water.</font></div><div><font size="4">I downloaded required files in Tielman site and made the .top file. Then included the CHARMM27.ff in the .top file.</font></div><div><font size="4">When I run the grompp I get the fatal error as below:</font></div><div><font size="4">Atomtype CB not found<br></font></div><div><font size="4"><br></font></div><div><font size="4">I have done the same with gromos87.ff . But I didn't see any error.</font></div><div><font size="4">What's the problem?</font></div><div><font size="4">Anybody may suggest me how to solve this problem? Is this because of the forcefield? Or something in .top file goes wrong?</font></div><div><font size="4"><br></font></div><div><font
size="4">Thanks,</font></div><div><font size="4">Shima</font><br></div></div></body></html>