Traceback (most recent call last):


 "min_example.py", line 28, in <module>

flow.visualize(flow_state=state)


 "/Users/jtherhaa/miniconda3/envs/prefect/lib/python3.6/site-packages/prefect/core/flow.py", line 1089, in visualize

for map_index, _ in enumerate(flow_state.result[t].map_states):
AttributeError: 'Skipped' object has no attribute 'map_states'

Traceback (most recent call last):


 "/usr/local/miniconda/lib/python3.7/site-packages/nipype/pipeline/plugins/multiproc.py", line 269, in _send_procs_to_workers

num_subnodes = self.procs[jobid].num_subnodes()


 "/usr/local/miniconda/lib/python3.7/site-packages/nipype/pipeline/engine/nodes.py", line 1204, in num_subnodes

self._get_inputs()


 "/usr/local/miniconda/lib/python3.7/site-packages/nipype/pipeline/engine/nodes.py", line 1219, in _get_inputs

super(MapNode, self)._get_inputs()


 "/usr/local/miniconda/lib/python3.7/site-packages/nipype/pipeline/engine/nodes.py", line 521, in _get_inputs

outputs = _load_resultfile(results_file)[0].outputs


 "/usr/local/miniconda/lib/python3.7/site-packages/nipype/pipeline/engine/utils.py", line 311, in load_resultfile

if resolve and result.outputs:
AttributeError: 'NoneType' object has no attribute 'outputs'
