ERROR: Failure: TypeError (Can't instantiate abstract class TestDatabase with abstract methods annotations)

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ERROR: Failure: TypeError (Can't instantiate abstract class TestDatabase with abstract methods annotations)
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Traceback (most recent call last):
  File "/scratch/builds/bob/bob.nightlies/miniconda/conda-bld/bob.pad.base_1585423863782/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_pl/lib/python3.6/site-packages/nose/failure.py", line 39, in runTest
    raise self.exc_val.with_traceback(self.tb)
  File "/scratch/builds/bob/bob.nightlies/miniconda/conda-bld/bob.pad.base_1585423863782/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_pl/lib/python3.6/site-packages/nose/loader.py", line 522, in makeTest
    return self._makeTest(obj, parent)
  File "/scratch/builds/bob/bob.nightlies/miniconda/conda-bld/bob.pad.base_1585423863782/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_pl/lib/python3.6/site-packages/nose/loader.py", line 581, in _makeTest
    return MethodTestCase(obj)
  File "/scratch/builds/bob/bob.nightlies/miniconda/conda-bld/bob.pad.base_1585423863782/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_pl/lib/python3.6/site-packages/nose/case.py", line 345, in __init__
    self.inst = self.cls()
TypeError: Can't instantiate abstract class TestDatabase with abstract methods annotations