Traceback (most recent call last):


 "<stdin>", line 1, in <module>


 ".local/lib/python3.7/site-packages/web3/eth.py", line 141, in getBlock

[block_identifier, full_transactions],


 ".local/lib/python3.7/site-packages/web3/manager.py", line 109, in request_blocking

response = self._make_request(method, params)


 ".local/lib/python3.7/site-packages/web3/manager.py", line 92, in _make_request

return request_func(method, params)


 "cytoolz/functoolz.pyx", line 236, in cytoolz.functoolz.curry.__call__


 "cytoolz/functoolz.pyx", line 232, in cytoolz.functoolz.curry.__call__


 ".local/lib/python3.7/site-packages/web3/middleware/formatting.py", line 50, in apply_formatters

response = make_request(method, params)


 ".local/lib/python3.7/site-packages/web3/middleware/gas_price_strategy.py", line 18, in middleware

return make_request(method, params)


 "cytoolz/functoolz.pyx", line 236, in cytoolz.functoolz.curry.__call__


 "cytoolz/functoolz.pyx", line 232, in cytoolz.functoolz.curry.__call__


 ".local/lib/python3.7/site-packages/web3/middleware/formatting.py", line 48, in apply_formatters

response = make_request(method, formatted_params)


 ".local/lib/python3.7/site-packages/web3/middleware/attrdict.py", line 18, in middleware

response = make_request(method, params)


 "cytoolz/functoolz.pyx", line 236, in cytoolz.functoolz.curry.__call__


 "cytoolz/functoolz.pyx", line 232, in cytoolz.functoolz.curry.__call__


 ".local/lib/python3.7/site-packages/web3/middleware/formatting.py", line 57, in apply_formatters

formatter(response['result']),


 "cytoolz/functoolz.pyx", line 236, in cytoolz.functoolz.curry.__call__


 "cytoolz/functoolz.pyx", line 232, in cytoolz.functoolz.curry.__call__


 ".local/lib/python3.7/site-packages/web3/utils/formatters.py", line 57, in apply_formatter_if

return formatter(value)


 "cytoolz/functoolz.pyx", line 236, in cytoolz.functoolz.curry.__call__


 "cytoolz/functoolz.pyx", line 232, in cytoolz.functoolz.curry.__call__


 "local/lib/python3.7/site-packages/eth_utils/functional.py", line 46, in inner

return callback(fn(*args, **kwargs))


 ".local/lib/python3.7/site-packages/web3/utils/formatters.py", line 70, in apply_formatters_to_dict

raise type(exc)("Could not format value %r as field %r" % (item, key)) from exc
TypeError: Could not format value [{'hash': '0x4e935981d89dd1634416ee1e761eadab6fc71c21e776519f01e4a188b0bf73b6', 

Traceback (most recent call last):


 "/home/dang/anaconda3/envs/idaes-dev3/bin/pipenv", line 11, in <module>

sys.exit(cli())


 "/home/dang/anaconda3/envs/idaes-dev3/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 722, in __call__

return self.main(*args, **kwargs)


 "/home/dang/anaconda3/envs/idaes-dev3/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 697, in main

rv = self.invoke(ctx)


 "/home/dang/anaconda3/envs/idaes-dev3/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 1066, in invoke

return _process_result(sub_ctx.command.invoke(sub_ctx))


 "/home/dang/anaconda3/envs/idaes-dev3/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 895, in invoke

return ctx.invoke(self.callback, **ctx.params)


 "/home/dang/anaconda3/envs/idaes-dev3/lib/python3.6/site-packages/pipenv/vendor/click/core.py", line 535, in invoke

return callback(*args, **kwargs)


 "/home/dang/anaconda3/envs/idaes-dev3/lib/python3.6/site-packages/pipenv/cli.py", line 402, in install

selective_upgrade=selective_upgrade,


 "/home/dang/anaconda3/envs/idaes-dev3/lib/python3.6/site-packages/pipenv/core.py", line 1787, in do_install

skip_requirements=skip_requirements,


 "/home/dang/anaconda3/envs/idaes-dev3/lib/python3.6/site-packages/pipenv/core.py", line 648, in ensure_project

ensure_pipfile(validate=validate, skip_requirements=skip_requirements, system=system)


 "/home/dang/anaconda3/envs/idaes-dev3/lib/python3.6/site-packages/pipenv/core.py", line 279, in ensure_pipfile

project.create_pipfile(python=python)


 "/home/dang/anaconda3/envs/idaes-dev3/lib/python3.6/site-packages/pipenv/project.py", line 588, in create_pipfile

required_python = self.which('python')


 "/home/dang/anaconda3/envs/idaes-dev3/lib/python3.6/site-packages/pipenv/core.py", line 126, in which

p = os.sep.join([location] + ['bin/{0}'.format(command)])
TypeError: sequence item 0: expected str instance, NoneType found
