[gmx-users] Step Four: Adding Ions

Maximiliano Sebastián Castillo mcastillo at itba.edu.ar
Sun Aug 19 19:22:40 CEST 2018

Hello! I'm doing "GROMACS Tutorial" and I have the next error:

Command line:
  gmx grompp -f ions.mdp -c 1AKI_solv.gro -p topol.top -o ions.tpr

Program:     gmx grompp, version 2018.2
Source file: src/gromacs/commandline/cmdlineparser.cpp (line 276)
Function:    void gmx::CommandLineParser::parse(int*, char**)

Error in user input:
Invalid command-line options
  In command-line option -f
    File 'ions.mdp' does not exist or is not accessible.
    The file could not be opened.
      Reason: No such file or directory
      (call to fopen() returned error code 2)

For more information and tips for troubleshooting, please check the GROMACS
website at http://www.gromacs.org/Documentation/Errors

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