I tried to continue the simulation with restart file with cp2k8.1. The first simulation starts from a PDB coordinate file and finished normally.
However, the new simulation gives Unknown element for KIND <HX1> error. when reading the restart file, even though no PDB file is being provided.
The first simulation is run with the command cp2k.sopt monitor.inp > monitor.out.
The second simulation is run with the command cp2k.sopt metaD.inp > metaD.out.
The input and out files are attached.