hello guys!

I am using the following command to restart my protein simulation that has stopped in 60 ns (total simulation is100 ns)

> gmx mdrun -v -deffnm 6_md -cpi 6_md.cpt -append

however, once I give this command a fatal error appears:

Failed to lock: 6_md.log. No locks available.

Does anyone know how to solve this and do a restart? I am using Gromacs 2018 version.

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