<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div>Dear gmx users,</div><div><br></div><div>When I enter the grompp command, I get this fatal error. How can I solve its problem?</div><div><br></div><div># grompp -f ions.mdp -c monomer_solv.gro -p topol.top -o ions.tpr</div><div><br></div><div>Thanks in advance,</div><div>Shima<br></div></div></body></html>