proj = pf.h.proj(0,"Density",center=[0.5]*3,source=reg)
File "/share/home/00649/tg457850/yt/lib/python2.6/site-packages/yt-1.5dev.dev_r1159-py2.6-linux-x86_64.egg/yt/lagos/BaseDataTypes.py", line 924, in __init__
self._refresh_data()
File "/share/home/00649/tg457850/yt/lib/python2.6/site-packages/yt-1.5dev.dev_r1159-py2.6-linux-x86_64.egg/yt/lagos/BaseDataTypes.py", line 186, in _refresh_data
self.get_data()
File "/share/home/00649/tg457850/yt/lib/python2.6/site-packages/yt-1.5dev.dev_r1159-py2.6-linux-x86_64.egg/yt/lagos/BaseDataTypes.py", line 1134, in get_data
data = self._mpi_catdict(data)
File "/share/home/00649/tg457850/yt/lib/python2.6/site-packages/yt-1.5dev.dev_r1159-py2.6-linux-x86_64.egg/yt/lagos/ParallelTools.py", line 146, in passage
return func(self, data)
File "/share/home/00649/tg457850/yt/lib/python2.6/site-packages/yt-1.5dev.dev_r1159-py2.6-linux-x86_64.egg/yt/lagos/ParallelTools.py", line 231, in _mpi_catdict
self._barrier()
File "/share/home/00649/tg457850/yt/lib/python2.6/site-packages/yt-1.5dev.dev_r1159-py2.6-linux-x86_64.egg/yt/lagos/ParallelTools.py", line 226, in _barrier
mylog.debug("Opening MPI Barrier on %s", MPI.COMM_WORLD.rank)
File "Comm.pyx", line 68, in mpi4py.MPI.Comm.rank.__get__ (src/mpi4py_MPI.c:32300)
File "Comm.pyx", line 62, in mpi4py.MPI.Comm.Get_rank (src/mpi4py_MPI.c:32254)
mpi4py.MPI.Exception: Communicator argument is not a valid communicator
Special bit pattern c154000 in communicator is incorrect. May indicate an
out-of-order argument or a freed communicator