2022-01-04 23:45:38 - dagster - ERROR - hello_cereal_shield_job - b1817925-525e-4768-ae49-2937cf528ab7 - 610 - RUN_FAILURE - Execution of run for "hello_cereal_shield_job" failed. An exception was thrown during execution.

RuntimeError: 
        An attempt has been made to start a new process before the
        current process has finished its bootstrapping phase.

        This probably means that you are not using fork to start your
        child processes and you have forgotten to use the proper idiom
        in the main module:

            if __name__ == '__main__':
                freeze_support()
                ...

        The "freeze_support()" line can be omitted if the program
        is not going to be frozen to produce an executable.

Stack Trace:
  File "/app/web/piper/hmc/dagster_cli_bin.runfiles/pypi__36__dagster_0_13_4_linux_x86_64/dagster/core/execution/api.py", line 774, in pipeline_execution_iterator
    for event in pipeline_context.executor.execute(pipeline_context, execution_plan):
  File "/app/web/piper/hmc/dagster_cli_bin.runfiles/pypi__36__dagster_0_13_4_linux_x86_64/dagster/core/executor/multiprocess.py", line 163, in execute
    event_or_none = next(step_iter)
  File "/app/web/piper/hmc/dagster_cli_bin.runfiles/pypi__36__dagster_0_13_4_linux_x86_64/dagster/core/executor/multiprocess.py", line 268, in execute_step_out_of_process
    for ret in execute_child_process_command(command):
  File "/app/web/piper/hmc/dagster_cli_bin.runfiles/pypi__36__dagster_0_13_4_linux_x86_64/dagster/core/executor/child_process_executor.py", line 140, in execute_child_process_command
    process.start()
  File "/usr/local/lib/python3.6/multiprocessing/process.py", line 105, in start
    self._popen = self._Popen(self)
  File "/usr/local/lib/python3.6/multiprocessing/context.py", line 284, in _Popen
    return Popen(process_obj)
  File "/usr/local/lib/python3.6/multiprocessing/popen_spawn_posix.py", line 32, in __init__
    super().__init__(process_obj)
  File "/usr/local/lib/python3.6/multiprocessing/popen_fork.py", line 19, in __init__
    self._launch(process_obj)
  File "/usr/local/lib/python3.6/multiprocessing/popen_spawn_posix.py", line 42, in _launch
    prep_data = spawn.get_preparation_data(process_obj._name)
  File "/usr/local/lib/python3.6/multiprocessing/spawn.py", line 143, in get_preparation_data
    _check_not_importing_main()
  File "/usr/local/lib/python3.6/multiprocessing/spawn.py", line 136, in _check_not_importing_main
    is not going to be frozen to produce an executable.''')