Hi Marko, I apologize for the slow response.
"pdb2gmx" is not an executable, but an argument. Try gmx.commandline_operation( 'gmx', ['pdb2gmx', '-water', 'spce', '-ff', 'oplsaa'] ...) I hope to be able to improve the documentation soon, but the exception should have been more helpful. I have created issue #3376 at https://redmine.gromacs.org/issues/3376 Best, Eric On Tue, Feb 4, 2020 at 5:55 PM < gromacs.org_gmx-users-requ...@maillist.sys.kth.se> wrote: > > test=gmx.commandline_operation(executable = "pdb2gmx", > arguments = ["-water", "spce" > ,"-ff", "oplsaa" > ] > ... -- Gromacs Users mailing list * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/GMX-Users_List before posting! * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists * For (un)subscribe requests visit https://maillist.sys.kth.se/mailman/listinfo/gromacs.org_gmx-users or send a mail to gmx-users-requ...@gromacs.org.