Hi! I use tleap to generate topology file of a RNA molecule with parmbsc0 ff. Then I generate .gro and .top files of that with amb2gmx.pl. I'm manually add this lines to .top file
; Include water topology #include "amber99sb.ff/tip4p.itp" ; Include topology for ions #include "amber99sb.ff/ions.itp" but after running this code: grompp -f ions.mdp -c ribozyme_solv.gro -p ribozyme.top -o ions.tpr I've got this error message: Program grompp, VERSION 4.5.5 Source code file: /build/buildd/gromacs-4.5.5/src/kernel/toppush.c, line: 1166 Fatal error: Atomtype OW_tip4p not found what should I do? Regards, Amir
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