`Traceback (most recent call last):


 "C:/PythonV/dedupeio/dedupe-examples/pgsql_big_dedupe_example/csa_big_dedupe_example.py", line 237, in <module>

csv_writer.writerows(b_data)


 "C:\PythonV\dedupeio\dedupe\lib\site-packages\dedupe\blocking.py", line 43, in __call__

record_id, instance = record
TypeError: cannot unpack non-iterable int object`

Traceback (most recent call last):


 "/opt/conda/lib/python3.6/site-packages/flask/app.py", line 2446, in wsgi_app

response = self.full_dispatch_request()


 "/opt/conda/lib/python3.6/site-packages/flask/app.py", line 1951, in full_dispatch_request

rv = self.handle_user_exception(e)


 "/opt/conda/lib/python3.6/site-packages/flask/app.py", line 1820, in handle_user_exception

reraise(exc_type, exc_value, tb)


 "/opt/conda/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise

raise value


 "/opt/conda/lib/python3.6/site-packages/flask/app.py", line 1949, in full_dispatch_request

rv = self.dispatch_request()


 "/opt/conda/lib/python3.6/site-packages/flask/app.py", line 1935, in dispatch_request

return self.view_functions[rule.endpoint](**req.view_args)


 "/opt/conda/lib/python3.6/site-packages/mlflow/server/handlers.py", line 105, in wrapper

response.set_data(e.serialize_as_json())


 "/opt/conda/lib/python3.6/site-packages/mlflow/exceptions.py", line 50, in serialize_as_json

return json.dumps(exception_dict)


 "/opt/conda/lib/python3.6/json/__init__.py", line 231, in dumps

return _default_encoder.encode(obj)


 "/opt/conda/lib/python3.6/json/encoder.py", line 199, in encode

chunks = self.iterencode(o, _one_shot=True)


 "/opt/conda/lib/python3.6/json/encoder.py", line 257, in iterencode

return _iterencode(o, 0)


 "/opt/conda/lib/python3.6/json/encoder.py", line 180, in default

o.__class__.__name__)
TypeError: Object of type 'OperationalError' is not JSON serializable
