pgadmin4 无法在ubuntu18.04运行

[zaiai2003]

我是wubi安装的ubuntu18.04，安装的pgadmin4-3.0*.whl，安装成功了。我使用python3.6.5的pip3安装的，然后用python3运行pgadmin4.py。出现错误，如下：
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hengaini2055@ubuntu:~/.local/lib/python3.6/site-packages/pgadmin4$ sudo python3 ./pgAdmin4.py
Traceback (most recent call last):
File "./pgAdmin4.py", line 70, in <module>
app = create_app()
File "/home/hengaini2055/.local/lib/python3.6/site-packages/pgadmin4/pgadmin/__init__.py", line 310, in create_app
schema_version = version.value
AttributeError: 'NoneType' object has no attribute 'value'
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请问这是怎么回事呢？