Hi all GMX usersI hope you are wellI have simulated a protein-ligand complex. My protein has two calcium ions. I want to use GMXPBSA approach for free energy calculation. I have two question, please guide me:1- must I remove calcium ions in free energy calculation?2- If I remove calcium ions, I will get following error in the first step of MMPBSA calculation:Fatal error: Index[1673] 1676 is larger than the number of atoms in the trajectory file (1675). There is a mismatch in the contents of your -f, -s and/or -n files.Thank you so much
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