Parallel Projection Plot Error

yt : [INFO     ] 2017-07-08 17:18:22,294 Global parallel computation enabled: 0 / 2
yt : [INFO     ] 2017-07-08 17:18:22,294 Global parallel computation enabled: 1 / 2
P000 yt : [INFO     ] 2017-07-08 17:18:22,311 Calculating time from 2.500e-01 to be 6.769e+16 seconds
P000 yt : [INFO     ] 2017-07-08 17:18:22,311 Assuming length units are in kpc/h (comoving)
P000 yt : [INFO     ] 2017-07-08 17:18:22,335 Parameters: current_time              = 6.76870468653e+16 s
P000 yt : [INFO     ] 2017-07-08 17:18:22,335 Parameters: domain_dimensions         = [2 2 2]
P000 yt : [INFO     ] 2017-07-08 17:18:22,336 Parameters: domain_left_edge          = [ 0.  0.  0.]
P000 yt : [INFO     ] 2017-07-08 17:18:22,336 Parameters: domain_right_edge         = [ 15000.  15000.  15000.]
P000 yt : [INFO     ] 2017-07-08 17:18:22,336 Parameters: cosmological_simulation   = 1
P000 yt : [INFO     ] 2017-07-08 17:18:22,336 Parameters: current_redshift          = 3.0
P000 yt : [INFO     ] 2017-07-08 17:18:22,336 Parameters: omega_lambda              = 0.685
P000 yt : [INFO     ] 2017-07-08 17:18:22,336 Parameters: omega_matter              = 0.315
P000 yt : [INFO     ] 2017-07-08 17:18:22,337 Parameters: hubble_constant           = 0.6731
P000 yt : [INFO     ] 2017-07-08 17:18:22,341 Allocating for 3.277e+04 particles (index particle type 'all')
P000 yt : [INFO     ] 2017-07-08 17:18:22,347 Identified 2.177e+03 octs
  File "./parallel_plot.py", line 30, in <module>
P000 yt : [INFO     ] 2017-07-08 17:18:24,400 Projection completed
    prj = yt.ProjectionPlot(ds, fields=('deposit', 'Halo_density'), axis='z')
  File "/home/polaris/Research/yt_rockstar/yt/visualization/plot_window.py", line 1521, in __init__
    max_level=max_level)
  File "/home/polaris/Research/yt_rockstar/yt/data_objects/construction_data_containers.py", line 264, in __init__
    self.get_data(field)
  File "/home/polaris/Research/yt_rockstar/yt/data_objects/construction_data_containers.py", line 383, in get_data
    input_units = self._projected_units[field]
P001 yt : [ERROR    ] 2017-07-08 17:18:24,401 KeyError: ('deposit', 'Halo_density')
P001 yt : [ERROR    ] 2017-07-08 17:18:24,401 Error occured on rank 1.
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 1 in communicator MPI_COMM_WORLD
with errorcode 1.

NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.