an't get attribute 'StateArrayXYXdYdXddYddH' on <module 'trajdata.data_structures.state' from

[lioxkk]

Traceback (most recent call last):
File "", line 1, in
File "D:\anaconda3\envs\trajdata-main\lib\multiprocessing\spawn.py", line 116, in spawn_main
exitcode = _main(fd, parent_sentinel)
File "D:\anaconda3\envs\trajdata-main\lib\multiprocessing\spawn.py", line 126, in _main
self = reduction.pickle.load(from_parent)
AttributeError: Can't get attribute 'StateArrayXYXdYdXddYddH' on <module 'trajdata.data_structures.state' from 'D:\anaconda3\envs\trajdata-main\lib\site-packages\trajdata\data_structures\state.py'>
@aflat @mjgarland @dumerrill @rowoflo @haoxingren please tell me how to deal it