[gmx-users] Atom Type not found............

[PAVAN PAYGHAN]

HI
   i have generated a topology file for drug using prodrg with gromos
96.1force field , now i want to use it for simulation with DNA in complex. I
am using amber 03 force field for my system . i have included correctly the
drg.itp file in generated topology file for DNA alone (using pdb2gmx).
i  managed  to run upto genbox successfully ,but when i tried to run grompp
it showed error
"Atom type 'CH1' not found !"
where i have to modify the things to work it properly .
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