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I am having problems with grompp with my system. <br><br>I am using Gromacs 4.5.3<br>FF = Charmm27 beta<br>WT = TIP3P (recommended and its claimed its not too different than Charmms TIP3P)<br><br>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). <br><br>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). <br><br>IS IT A BUG or I am doing something wrong. <br><br><br>I can add more information if needed.<br><br>Thanks,<br><br> </body>
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