[gmx-users] Fatal error: Atomtype O2 not found

[ramaraju801]

hi 

am working on a DNA-protein complex, during the energy minimization step its
giving the following error,
"Fatal error:
Atomtype O2 not found"

am using charmm27 force field and used the command "grompp -f minim.mdp -c
protein.gro -p protein.top -o protein-EM-vacuum.tpr "    

regards,
ram

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