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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