start server error

Traceback (most recent call last):
File "proxyPool.py", line 45, in
cli()
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "proxyPool.py", line 40, in server
from api.proxyApi import runFlask
File "/root/src/proxy_pool/proxy_pool/api/proxyApi.py", line 28, in
app = Flask('api.proxyApi')
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/flask/app.py", line 556, in __init__
self.add_url_rule(
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/flask/app.py", line 64, in wrapper_func
return f(self, *args, **kwargs)
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/flask/app.py", line 1214, in add_url_rule
self.url_map.add(rule)
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/werkzeug/routing.py", line 1386, in add
rule.bind(self)
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/werkzeug/routing.py", line 730, in bind
self.compile()
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/werkzeug/routing.py", line 794, in compile
self._build = self._compile_builder(False).__get__(self, None)
File "/root/.pyenv/versions/3.8.1/lib/python3.8/site-packages/werkzeug/routing.py", line 945, in _compile_builder
code = compile(module, "", "exec")
TypeError: required field "type_ignores" missing from Module

fix:
Upgrade werkzeug to 0.15.5