# Error problem **URL:** \ **Category:** User discussions\ **Created:** [January 28, 2026, 7:27pm UTC](https://gromacs.bioexcel.eu/t/error-problem/13153 "2026-01-28T19:27:08Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![mondalritam](https://avatars.discourse-cdn.com/v4/letter/m/b77776/32.png) [@mondalritam](https://gromacs.bioexcel.eu/u/mondalritam)\ **Post date:** [January 28, 2026, 7:27pm UTC](https://gromacs.bioexcel.eu/t/error-problem/13153/1 "2026-01-28T19:27:08Z")
GROMACS version: GROMACS modification: Yes/No Here post your question gmx grompp -f em.mdp -c solv\_ions.gro -p topol.top -o em.tpr :-) GROMACS - gmx grompp, 2026.0 (-: Executable: /usr/local/gromacs/bin/gmx Data prefix: /usr/local/gromacs Working dir: /mnt/d/vchemistry3 Command line: gmx grompp -f em.mdp -c solv\_ions.gro -p topol.top -o em.tpr Ignoring obsolete mdp entry ‘ns\_type’ Setting the LD random seed to -1348135077 Generated 22578 of the 22578 non-bonded parameter combinations Generating 1-4 interactions: fudge = 1 Generated 19452 of the 22578 1-4 parameter combinations Excluding 3 bonded neighbours molecule type ‘Protein\_chain\_A’ Excluding 3 bonded neighbours molecule type ‘LIG’ Excluding 2 bonded neighbours molecule type ‘SOL’ Excluding 1 bonded neighbours molecule type ‘NA’ Analysing residue names: There are: 901 Protein residues There are: 1 Other residues There are: 80727 Water residues There are: 6 Ion residues Analysing Protein… Analysing residues not classified as Protein/DNA/RNA/Water and splitting into groups… Number of degrees of freedom in T-Coupling group rest is 526845.00 The integrator does not provide a ensemble temperature, there is no system ensemble temperature The largest distance between excluded atoms is 3.571 nm between atom 5498 and 5517 WARNING 1 [file em.mdp]: The largest distance between excluded atoms is 3.571 nm between atom 5498 and 5517, which is larger than the cut-off distance. This will lead to missing long-range corrections in the forces and energies. If you expect that minimization will bring such distances within the cut-off, you can ignore this warning. Calculating fourier grid dimensions for X Y Z Using a fourier grid of 144x144x144, spacing 0.107 0.107 0.107 Estimate for the relative computational load of the PME mesh part: 0.24 This run will generate roughly 20 Mb of data There was 1 WARNING * * * Program: gmx grompp, version 2026.0 Source file: src/gromacs/gmxpreprocess/grompp.cpp (line 2917) Fatal error: Too many warnings (1). If you are sure all warnings are harmless, use the -maxwarn option. mondalritam@LAPTOP-CE3QKKL9:/mnt/d/vchemistry3$ gmx grompp -f em.mdp -c solv\_ions.gro -p topol.top -o em.tpr -maxwarm :-) GROMACS - gmx grompp, 2026.0 (-: Executable: /usr/local/gromacs/bin/gmx Data prefix: /usr/local/gromacs Working dir: /mnt/d/vchemistry3 Command line: gmx grompp -f em.mdp -c solv\_ions.gro -p topol.top -o em.tpr -maxwarm * * * Program: gmx grompp, version 2026.0 Source file: src/gromacs/commandline/cmdlineparser.cpp (line 271) Function: void gmx::CommandLineParser::parse(int\*, char\*\*) Error in user input: Invalid command-line options Unknown command-line option -maxwarm For more information and tips for troubleshooting, please check the GROMACS website at [Common errors when using GROMACS - GROMACS 2026.0 documentation](https://manual.gromacs.org/current/user-guide/run-time-errors.html) give me exact command line for the solution of the problem ---
**Author:** ![lmullender](https://avatars.discourse-cdn.com/v4/letter/l/8dc957/32.png) [@lmullender](https://gromacs.bioexcel.eu/u/lmullender)\ **Post date:** [January 29, 2026, 12:05pm UTC](https://gromacs.bioexcel.eu/t/error-problem/13153/2 "2026-01-29T12:05:20Z")
You’re not talking to an LLM here, this is a forum with real people taking their time to answer questions. “give me exact solution” is not a very nice way to ask for help. For what it’s worth though, there’s a typo in “-maxwarm”, should be “-maxwarn 1”, you have to specify a number.