PicklingError on HPC

[kbstn]

When i run my code on local machine its working fine but on skylla HPC i got following error (same versions given):
File "simple_lumped1593.py", line 539, in <module> save_sim=False) File "/home/gh2521/.local/lib/python3.5/site-packages/spotpy/algorithms/lhs.py", line 59, in __init__ super(lhs, self).__init__(*args, **kwargs) File "/home/gh2521/.local/lib/python3.5/site-packages/spotpy/algorithms/_algorithm.py", line 183, in __init__ self.repeat.start() File "/home/gh2521/.local/lib/python3.5/site-packages/spotpy/parallel/mpi.py", line 165, in start self.__wait() File "/home/gh2521/.local/lib/python3.5/site-packages/spotpy/parallel/mpi.py", line 132, in __wait self.comm.send(res, dest=0, tag=tag.answer) File "MPI/Comm.pyx", line 1175, in mpi4py.MPI.Comm.send (src/mpi4py.MPI.c:106424) File "MPI/msgpickle.pxi", line 210, in mpi4py.MPI.PyMPI_send (src/mpi4py.MPI.c:42085) File "MPI/msgpickle.pxi", line 112, in mpi4py.MPI.Pickle.dump (src/mpi4py.MPI.c:40704) _pickle.PicklingError: Can't pickle <class 'SwigPyObject'>: attribute lookup SwigPyObject on builtins failed

[kbstn]

if i return an numpy.array in the spotpy simulation function, the problem does not occur anymore.