<div>Hello,</div>
<div>I am Marcelo and I am a new user of Gromacs. When I use the programme pdb2gmx the following fatal error happens:</div>
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<div><strong>Fatal error: Chain identifier 'S' was used in two non-sequential blocks (residue 7, atom 101)</strong></div>
<div><strong></strong> </div>
<div>The thing is that I am not using "chain indentifiers.</div>
<div>Could someone help me, please?</div>
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<div>Thanks a lot</div>
<div> </div>
<div>Marcelo</div>