google.api_core.exceptions.PermissionDenied: 403 Missing or insufficient permissions.

Traceback (most recent call last):
  File "main.py", line 17, in <module>
    for doc in docs:
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/google/cloud/firestore_v1/query.py", line 276, in stream
    timeout,
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/google/cloud/firestore_v1/query.py", line 221, in _get_stream_iterator
    **kwargs,
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/google/cloud/firestore_v1/services/firestore/client.py", line 1307, in run_query
    metadata=metadata,
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/google/api_core/gapic_v1/method.py", line 154, in __call__
    return wrapped_func(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/google/api_core/retry.py", line 288, in retry_wrapped_func
    on_error=on_error,
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/google/api_core/retry.py", line 190, in retry_target
    return target()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/google/api_core/grpc_helpers.py", line 166, in error_remapped_callable
    raise exceptions.from_grpc_error(exc) from exc
google.api_core.exceptions.PermissionDenied: 403 Missing or insufficient permissions.