IPPL extra message error

OPAL crashes for > 16 cores (but works with #cores = 4) with the error message

Error{0}> get_iter(): no more items in Message

Error{0}> reduce: mismatched element count in vector reduction.

Warning{0}> CommMPI: Found extra message from node 11, tag 10218: msg = Message contains 2 items (0 removed). Contents:

Warning{0}> Item 0: 1 elements, 1 bytes total, needDelete = 0

Warning{0}> Item 1: 3 elements, 24 bytes total, needDelete = 0

in case of serial x and y directions (i.e. PARFFTX=false, PARFFTY=false) and parallel z direction (i.e. PARFFTT=true). The simulation that was ran is psiring.in. The fieldmaps can be found in the repository AMAS-BDModels / PSI-Ring. Following modules were used for running on Merlin:

module use unstable

module add gcc/5.4.0

module add openmpi/1.10.4

module add hdf5/1.8.18

module add H5hut/2.0.0rc3

module add trilinos/12.10.1

module add gsl/2.2.1

module add boost/1.62.0

When changing to parallel x, y and serial z, i.e. PARFFTX=true, PARFFTY=true and PARFFTT=false) no error occurs.