Symbol not found: _olm_account_fallback_key

Does this mean anything to anyone?

Unable to import answers_bot.main: dlopen(/Users/tom/.virtualenvs/answers-bot/lib/python3.7/site-packages/python_olm-3.1.5-py3.7-macosx-10.14-x86_64.egg/_libolm.abi3.so, 2): Symbol not found: _olm_account_fallback_key
  Referenced from: /Users/tom/.virtualenvs/answers-bot/lib/python3.7/site-packages/python_olm-3.1.5-py3.7-macosx-10.14-x86_64.egg/_libolm.abi3.so
  Expected in: flat namespace
 in /Users/tom/.virtualenvs/answers-bot/lib/python3.7/site-packages/python_olm-3.1.5-py3.7-macosx-10.14-x86_64.egg/_libolm.abi3.so

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