Hi, I have tried to add NaCl into my system in the 4.5.1 version to balance the total charge, and used OPLS forcefield. In the topol file file, it has CL- but no NA+. However, when I ran grompp_d, it gave me the following error message:
Program grompp_d, VERSION 4.5.1 Source code file: toppush.c, line: 1987 Fatal error: No such moleculetype CL- It did not happen when I used 4.0.7 version. I checked the top.itp file and CL- is defined. Any clue on how to fix it? Best, Simon
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