[yt-users] Error in Rockstar Halo Finding

[Reju Sam John]

Hi all,

I am trying to run Rockstar Halo Finding with the following code.

from yt.mods import *
from yt.analysis_modules.halo_finding.rockstar.api import RockstarHaloFinder

#find all of our simulation files
files = glob.glob("RD*/*hierarchy")

#hopefully the file name order is chronological
files.sort()
print files

ts = TimeSeriesData.from_filenames(files[:])
rh = RockstarHaloFinder(ts)
rh.run()

but I am getting the following error.
 File "rockstar_halo_finding.py", line 14, in <module>
    rh = RockstarHaloFinder(ts)
  File
"/home/john/yt_new/yt-x86_64/src/yt-hg/yt/analysis_modules/halo_finding/rockstar/rockstar.py",
line 220, in __init__
    self.pool, self.workgroup = self.runner.setup_pool()
  File
"/home/john/yt_new/yt-x86_64/src/yt-hg/yt/analysis_modules/halo_finding/rockstar/rockstar.py",
line 102, in setup_pool
    (self.num_writers, "writers") ]
  File
"/home/john/yt_new/yt-x86_64/src/yt-hg/yt/utilities/parallel_tools/parallel_analysis_interface.py",
line 325, in from_sizes
    pool.add_workgroup(size, name = name)
  File
"/home/john/yt_new/yt-x86_64/src/yt-hg/yt/utilities/parallel_tools/parallel_analysis_interface.py",
line 293, in add_workgroup
    group = self.comm.comm.Get_group().Incl(ranks)
AttributeError: 'NoneType' object has no attribute 'Get_group'

could you please explain what is going wrong here ?

Thank you.
-- 
Reju Sam John
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