The error message means "out of memory". Make sure you only assing 1 MPI process per physical machine when running in parallel. If you do, and still get the error, then you may have to adjust the parameters, perhaps lower the number of k-points in the z-director or otherwise reduce the memory requirement of the calculation.
Note that if you have dielectric and metallic regions, the poisson solver will be the multigrid solver which in 11.2 is very heavy in memory consumption. In the up comming release 11.8 there will be a new multigrid solver which uses less memory.
