Hello everyone<div>I am going to analysis the PDB file  3GJN.pdb.After giving the pdb2gmx it shows the fatal error<br><br></div><div>&quot;chain identifier &#39;B&#39; was used in two non-sequential blocks (residue 404, atom 3227)&quot;.So what is the solution for this.</div>
<div>                                                                                            Thank you</div><div>                                                                                            Abhijit</div>