Hi all,

I am trying to read enzo dataset with active particles and getting the following error. There are active particles as indicated by print statement prior to datadump but yt immediately raises this error after loading it. Any help in this regard will be appreciated. 

yt : [INFO     ] 2020-04-13 19:39:50,444 Parameters: current_time              = 12.774511689726

yt : [INFO     ] 2020-04-13 19:39:50,444 Parameters: domain_dimensions         = [256 256 256]

yt : [INFO     ] 2020-04-13 19:39:50,445 Parameters: domain_left_edge          = [0. 0. 0.]

yt : [INFO     ] 2020-04-13 19:39:50,445 Parameters: domain_right_edge         = [1. 1. 1.]

yt : [INFO     ] 2020-04-13 19:39:50,445 Parameters: cosmological_simulation   = 1

yt : [INFO     ] 2020-04-13 19:39:50,445 Parameters: current_redshift          = 23.138771212879

yt : [INFO     ] 2020-04-13 19:39:50,445 Parameters: omega_lambda              = 0.6911

yt : [INFO     ] 2020-04-13 19:39:50,445 Parameters: omega_matter              = 0.3089

yt : [INFO     ] 2020-04-13 19:39:50,445 Parameters: hubble_constant           = 0.6774

Parsing Hierarchy : 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 1771/1771 [00:00<00:00, 4770.60it/s]

yt : [INFO     ] 2020-04-13 19:39:50,937 Gathering a field list (this may take a moment.)

Traceback (most recent call last):

  File "ytdiv.py", line 20, in <module>

    print(ds.derived_field_list)

  File "/home/malatif/YT_DEV/yt-conda/lib/python3.7/site-packages/yt/data_objects/static_output.py", line 216, in ireq

    self.index

  File "/home/malatif/YT_DEV/yt-conda/lib/python3.7/site-packages/yt/data_objects/static_output.py", line 509, in index

    self, dataset_type=self.dataset_type)

  File "/home/malatif/YT_DEV/yt-conda/lib/python3.7/site-packages/yt/frontends/enzo/data_structures.py", line 195, in __init__

    GridIndex.__init__(self, ds, dataset_type)

  File "/home/malatif/YT_DEV/yt-conda/lib/python3.7/site-packages/yt/geometry/geometry_handler.py", line 58, in __init__

    self._detect_output_fields()

  File "/home/malatif/YT_DEV/yt-conda/lib/python3.7/site-packages/yt/frontends/enzo/data_structures.py", line 429, in _detect_output_fields

    ap_fields = self._detect_active_particle_fields()

  File "/home/malatif/YT_DEV/yt-conda/lib/python3.7/site-packages/yt/frontends/enzo/data_structures.py", line 388, in _detect_active_particle_fields

    node = handle["/Grid%08i/Particles/" % g.id]

  File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper

  File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper

  File "/home/malatif/YT_DEV/yt-conda/lib/python3.7/site-packages/h5py/_hl/group.py", line 262, in __getitem__

    oid = h5o.open(self.id, self._e(name), lapl=self._lapl)

  File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper

  File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper

  File "h5py/h5o.pyx", line 190, in h5py.h5o.open

KeyError: "Unable to open object (object 'Particles' doesn't exist)"