[gmx-users] Fatal error:Atom S in residue TYR 2 not found in rtp entry with 18 atoms

[kong.winter]

Hi all,
I'm a beginner to GMX,
when I use the following command:
"pdb2gmx -f 1G1S.pdb -p gr.top -o gr.gro -missing"

"WARNING: atom CD not found in residue 72 while adding improper
....
Fatal error:
Atom S in residue TYR 2 not found in rtp entry with 18 atoms
             while sorting atoms"

How to solve this fatal error? 
Thank you very much!
Best wishes,
                     Yours, Winter
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