I am having problems with grompp with my system. I am using Gromacs 4.5.3 FF = Charmm27 beta WT = TIP3P (recommended and its claimed its not too different than Charmms TIP3P)
during minimization with pbc, I get the error about box length being small if I add neutralizing ions (I do not get this error in just water+protein system). Also I have tried increasing my box length upto a cube of 40 Angstroms and still get the error ( I have a tiny 50 residue protein). IS IT A BUG or I am doing something wrong. I can add more information if needed. Thanks,
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