TypeError: register() takes 3 positional arguments but 4 were given

[AlbinDavid]

When running the main I'm facing this TypeError.The source of the error is while registering the sockets in blueprint

app.register_blueprint(html, url_prefix=r'/')
sockets.register_blueprint(ws, url_prefix=r'/')

app.register_blueprint seems to be working fine.

[nmz787]

same issue here

[nmz787]

got past the issue with this change, from:
blueprint.register(self, options, first_registration)

to:
blueprint.register(self, options)

not sure if that will break anytime though, as my application is completely new and I've never used this package before

[thewanghao]

you can run:
pip install --upgrade 'flask==1.1.2'