I was messing with python earlier and now I'm trying to run the parallel hop, and I got this message: (I've installed Forthon with no problem, did a make under yt/extensions/kdtree already) gso:64x64x64 gso$ python parallelHF.py yt INFO 2010-10-28 16:10:21,666 Getting the binary hierarchy yt INFO 2010-10-28 16:10:21,673 Finished with binary hierarchy reading yt INFO 2010-10-28 16:10:21,675 Gathering a field list (this may take a moment.) yt INFO 2010-10-28 16:10:21,684 Adding Emissivity to list of fields yt INFO 2010-10-28 16:10:21,685 Adding Grey_Radiation_Energy to list of fields yt INFO 2010-10-28 16:10:22,002 Getting particle_position_x using ParticleIO yt INFO 2010-10-28 16:10:22,374 Getting ParticleMassMsun using ParticleIO yt INFO 2010-10-28 16:10:22,763 Initializing HOP yt INFO 2010-10-28 16:10:22,764 Getting creation_time using ParticleIO yt INFO 2010-10-28 16:10:23,149 Getting particle_position_y using ParticleIO yt INFO 2010-10-28 16:10:23,528 Getting particle_position_z using ParticleIO yt INFO 2010-10-28 16:10:23,917 Getting particle_index using ParticleIO yt INFO 2010-10-28 16:10:24,576 Distributing padded particles... yt INFO 2010-10-28 16:10:24,616 Building kd tree for 262144 particles... Traceback (most recent call last): File "parallelHF.py", line 16, in <module> rearrange=True, safety=1.5, premerge=True) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/yt-2.0dev-py2.6-macosx-10.6-intel.egg/yt/lagos/HaloFinding.py", line 1625, in __init__ threshold=threshold, dm_only=dm_only, rearrange=rearrange, premerge=premerge) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/yt-2.0dev-py2.6-macosx-10.6-intel.egg/yt/lagos/HaloFinding.py", line 1123, in __init__ HaloList.__init__(self, data_source, dm_only) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/yt-2.0dev-py2.6-macosx-10.6-intel.egg/yt/lagos/HaloFinding.py", line 795, in __init__ self._run_finder() File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/yt-2.0dev-py2.6-macosx-10.6-intel.egg/yt/lagos/HaloFinding.py", line 1144, in _run_finder self.threshold, rearrange=self.rearrange, premerge=self.premerge) File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/yt-2.0dev-py2.6-macosx-10.6-intel.egg/yt/lagos/parallelHOP/parallelHOP.py", line 61, in __init__ self._chain_hop() File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/yt-2.0dev-py2.6-macosx-10.6-intel.egg/yt/lagos/parallelHOP/parallelHOP.py", line 1421, in _chain_hop self._init_kd_tree() File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/yt-2.0dev-py2.6-macosx-10.6-intel.egg/yt/lagos/parallelHOP/parallelHOP.py", line 338, in _init_kd_tree fKD.dens = na.asfortranarray(na.zeros(self.size, dtype='float64')) NameError: global name 'fKD' is not defined Does anyone else have the same problem? Will reinstallation of YT on my mac fix it? From G.S.