GOT UnpicklingError: invalid load key, 'x'.\n\nAt:\n

[buptcjj]

Error Log
message":"UnpicklingError: invalid load key, 'x'.\n
At:\n /usr/local/python-3.7/lib/python3.7/site-packages/whoosh/filedb/structfile.py(245): read_pickle
/usr/local/python-3.7/lib/python3.7/site-packages/whoosh/codec/whoosh3.py(941): _goto
/usr/local/python-3.7/lib/python3.7/site-packages/whoosh/codec/whoosh3.py(961): _next_block
/usr/local/python-3.7/lib/python3.7/site-packages/whoosh/codec/whoosh3.py(1009): next
/usr/local/python-3.7/lib/python3.7/site-packages/whoosh/matching/mcore.py(215): all_ids

When I use whoosh in a concurrent scenario with multiple processes, the above-mentioned occasional errors occur.