Hi all,

I'm trying to run the RockstarHaloFinder via the HaloCatalog function on a TIPSY file. 
When I run the HaloCatalog function I get the following rockstar output:

########################################################################
P002 yt : [INFO     ] 2014-09-15 19:36:11,382 Rockstar is using 1 readers and 1 writers
P000 yt : [INFO     ] 2014-09-15 19:36:11,382 The citation for the Rockstar halo finder can be found at
P001 yt : [INFO     ] 2014-09-15 19:36:11,382 Rockstar is using 1 readers and 1 writers
P000 yt : [INFO     ] 2014-09-15 19:36:11,382 http://adsabs.harvard.edu/abs/2013ApJ...762..109B
P000 yt : [INFO     ] 2014-09-15 19:36:11,383 Rockstar is using 1 readers and 1 writers
P001 yt : [WARNING  ] 2014-09-15 19:36:41,582 Total Particle Count: 4.862e+07
[     0s] Accepting connections...
[     1s] Accepted all reader / writer connections.
[     1s] Verified all reader / writer connections.
[     1s] Transmitted all client connection info.
[     2s] Reading 1 blocks for snapshot 0...
Exception yt.utilities.exceptions.YTFieldNotFound: YTFieldNotFound() in 'yt.analysis_modules.halo_finding.rockstar.rockstar_interface.rh_read_particles' ignored
[     2s] Transferring particles to writers...
[     2s] Analyzing for FoF groups...
[     2s] Transferring boundary particles between writers...
[     2s] Linking boundary particles...
[     3s] Analyzing for halos / subhalos...
[     3s] Loading merger tree information...
[     3s] Constructing merger tree...
[     3s] [Success] Done with snapshot 0.
[     3s] [Finished]
#######################################################################

followed by the next  YT output

#######################################################################
P001 yt : [INFO     ] 2014-09-15 19:36:44,986 Parameters: current_time              = 2.44801700503e+17 s
P001 yt : [INFO     ] 2014-09-15 19:36:44,987 Parameters: domain_dimensions         = [2 2 2]
P000 yt : [INFO     ] 2014-09-15 19:36:44,994 Parameters: current_time              = 2.44801700503e+17 s
P000 yt : [INFO     ] 2014-09-15 19:36:44,994 Parameters: domain_dimensions         = [2 2 2]
P000 yt : [INFO     ] 2014-09-15 19:36:44,994 Parameters: domain_left_edge          = [ 0.  0.  0.]
P000 yt : [INFO     ] 2014-09-15 19:36:45,012 Parameters: domain_right_edge         = [ 0.00207136  0.00207136  0.00207136]
P000 yt : [INFO     ] 2014-09-15 19:36:45,013 Parameters: cosmological_simulation   = 1
P000 yt : [INFO     ] 2014-09-15 19:36:45,014 Parameters: current_redshift          = 0.6
P001 yt : [INFO     ] 2014-09-15 19:36:44,987 Parameters: domain_left_edge          = [ 0.  0.  0.]
P000 yt : [INFO     ] 2014-09-15 19:36:45,014 Parameters: omega_lambda              = 0.699999988079
P000 yt : [INFO     ] 2014-09-15 19:36:45,014 Parameters: omega_matter              = 0.300000011921
P000 yt : [INFO     ] 2014-09-15 19:36:45,014 Parameters: hubble_constant           = 0.699999988079
P001 yt : [INFO     ] 2014-09-15 19:36:45,014 Parameters: domain_right_edge         = [ 0.00207136  0.00207136  0.00207136]
P001 yt : [INFO     ] 2014-09-15 19:36:45,014 Parameters: cosmological_simulation   = 1
P001 yt : [INFO     ] 2014-09-15 19:36:45,015 Parameters: current_redshift          = 0.6
P001 yt : [INFO     ] 2014-09-15 19:36:45,015 Parameters: omega_lambda              = 0.699999988079
P001 yt : [INFO     ] 2014-09-15 19:36:45,015 Parameters: omega_matter              = 0.300000011921
P001 yt : [INFO     ] 2014-09-15 19:36:45,015 Parameters: hubble_constant           = 0.699999988079
P000 yt : [INFO     ] 2014-09-15 19:36:45,070 Allocating for 0.000e+00 particles
P001 yt : [INFO     ] 2014-09-15 19:36:45,070 Allocating for 0.000e+00 particles
P002 yt : [INFO     ] 2014-09-15 19:36:45,070 Allocating for 0.000e+00 particles
Traceback (most recent call last):
  File "simple_rockstar.py", line 44, in <module>
Traceback (most recent call last):
  File "simple_rockstar.py", line 44, in <module>
Traceback (most recent call last):
  File "simple_rockstar.py", line 44, in <module>
    hc.create()
  File "/home/bruno/apps/yt-x86_64/src/yt-hg/yt/analysis_modules/halo_analysis/halo_catalog.py", line 297, in create
    hc.create()
  File "/home/bruno/apps/yt-x86_64/src/yt-hg/yt/analysis_modules/halo_analysis/halo_catalog.py", line 297, in create
    hc.create()
  File "/home/bruno/apps/yt-x86_64/src/yt-hg/yt/analysis_modules/halo_analysis/halo_catalog.py", line 297, in create
    self._run(save_halos, save_catalog, njobs=njobs, dynamic=dynamic)
  File "/home/bruno/apps/yt-x86_64/src/yt-hg/yt/utilities/parallel_tools/parallel_analysis_interface.py", line 248, in barrierize
    self._run(save_halos, save_catalog, njobs=njobs, dynamic=dynamic)
    self._run(save_halos, save_catalog, njobs=njobs, dynamic=dynamic)
  File "/home/bruno/apps/yt-x86_64/src/yt-hg/yt/utilities/parallel_tools/parallel_analysis_interface.py", line 248, in barrierize
  File "/home/bruno/apps/yt-x86_64/src/yt-hg/yt/utilities/parallel_tools/parallel_analysis_interface.py", line 248, in barrierize
    retval = func(*args, **kwargs)
  File "/home/bruno/apps/yt-x86_64/src/yt-hg/yt/analysis_modules/halo_analysis/halo_catalog.py", line 367, in _run
    self.halos_ds.index
AttributeError: 'NoneType' object has no attribute 'index'
    retval = func(*args, **kwargs)
  File "/home/bruno/apps/yt-x86_64/src/yt-hg/yt/analysis_modules/halo_analysis/halo_catalog.py", line 367, in _run
    self.halos_ds.index
    retval = func(*args, **kwargs)
AttributeError: 'NoneType' object has no attribute 'index'
  File "/home/bruno/apps/yt-x86_64/src/yt-hg/yt/analysis_modules/halo_analysis/halo_catalog.py", line 367, in _run
    self.halos_ds.index
AttributeError: 'NoneType' object has no attribute 'index'
#######################################################################################

It seems to me like rockstar is not finding anything (Exception message) and  then when yt load and save to disk it fails.
The simplest working version of my code is the next one:

#######################################################################################
import yt
from yt.mods import *
from yt.analysis_modules.halo_analysis.api import HaloCatalog
from yt.data_objects.particle_filters import add_particle_filter
from mpi4py import MPI
import numpy as np

dataDir = "/home/bruno/Desktop/data/yt/"
dataFile = 'DM.Only.tipsy/dwf1.6144.01280'
ts = DatasetSeries([dataDir + dataFile])
data_ds = ts[0]
#data_ds = yt.load( dataDir + dataFile )
data_ds.set_units( )

#Add symbol "Mpccm"
data_ds.unit_registry.add( 'Mpccm',
 float(units.Mpc.in_cgs().v), 
 units.dimensions.length)

#Create particle filter to filter to filter a single mass particle type
def low_mass(pfilter, data):
    filter = data["all", "Mass"] < 1.3e-12 * units.Msun
    return filter
add_particle_filter("low_mass", function=low_mass, 
                    filtered_type='all',
                    requires=["Mass"])
data_ds.add_particle_filter("low_mass")

#Set cosmology parameters
data_ds.hubble_constant = 0.7  
data_ds.omega_matter = 0.3
data_ds.current_redshift = 0.6
data_ds.omega_lambda = 0.7

#Arguments for RockstarHoloFinder
rockstar_kwargs = {
'particle_type': 'low_mass',
'force_res': 1e-4  #100pc
}

hc = HaloCatalog(data_ds=data_ds
finder_method='rockstar', 
finder_kwargs = rockstar_kwargs)
hc.create()
##################################################################

If someone has any suggestion  I would really appreciate it.

Thanks,
Bruno