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c506-001[skx](1049)$ python3.7 ~/code/galaxy_analysis/cosmology/construct_tree.py 
yt : [INFO     ] 2020-07-16 23:18:54,029 Parameters: current_time              = 3.6943987972297224e+16 s
yt : [INFO     ] 2020-07-16 23:18:54,029 Parameters: domain_dimensions         = [2 2 2]
yt : [INFO     ] 2020-07-16 23:18:54,029 Parameters: domain_left_edge          = [0. 0. 0.]
yt : [INFO     ] 2020-07-16 23:18:54,029 Parameters: domain_right_edge         = [2.69440007 2.69440007 2.69440007]
yt : [INFO     ] 2020-07-16 23:18:54,029 Parameters: cosmological_simulation   = 1
yt : [INFO     ] 2020-07-16 23:18:54,030 Parameters: current_redshift          = 4.999999821186071
yt : [INFO     ] 2020-07-16 23:18:54,030 Parameters: omega_lambda              = 0.6847000122070312
yt : [INFO     ] 2020-07-16 23:18:54,030 Parameters: omega_matter              = 0.31529998779296875
yt : [INFO     ] 2020-07-16 23:18:54,030 Parameters: omega_radiation           = 0.0
yt : [INFO     ] 2020-07-16 23:18:54,030 Parameters: hubble_constant           = 0.6736000180244446
yt : [INFO     ] 2020-07-16 23:18:54,037 Allocating for 4.400e+02 particles (index particle type 'all')
yt : [INFO     ] 2020-07-16 23:18:54,042 Identified 1.530e+02 octs
treefarm: [INFO     ] 2020-07-16 23:18:54,483 Linking: basename             = RD0023                       - RD0022                      
treefarm: [INFO     ] 2020-07-16 23:18:54,484 Linking: current_time         = 1.170706427861706 Gyr        - 1.038626464238269 Gyr       
treefarm: [INFO     ] 2020-07-16 23:18:54,484 Linking: current_redshift     = 5                            - 5.4999983015996             
Parsing Hierarchy : 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 48/48 [00:00<00:00, 13744.31it/s]
yt : [INFO     ] 2020-07-16 23:18:54,491 Gathering a field list (this may take a moment.)
Traceback (most recent call last):
  File "/home1/02695/emerick/code/galaxy_analysis/cosmology/construct_tree.py", line 23, in <module>
    build_merger_tree()
  File "/home1/02695/emerick/code/galaxy_analysis/cosmology/construct_tree.py", line 15, in build_merger_tree
    my_tree.trace_ancestors("halos", my_id, filename = "test_halo/")
  File "/home1/02695/emerick/code/treefarm/treefarm/treefarm.py", line 281, in trace_ancestors
    if ds2.index.particle_count[halo_type] == 0:
AttributeError: 'EnzoHierarchy' object has no attribute 'particle_count'