Rasa: All rasa commands show errors after successful installation

[PilgrimViis]

Rasa version:
1.5.2
Rasa SDK version (if used & relevant):

Rasa X version (if used & relevant):
0.23.3
Python version:
Python 3.6.9 :: Anaconda, Inc.
Operating system (windows, osx, ...):
Windows 10
Issue:
After successful installation of Rasa on trying to iniitialize using rasa init an error is thrown. Rasa installed in anaconda virtual environment by using command from rasa installation guide
_pip install rasa-x --extra-index-url https://pypi.rasa.com/simple_
And looks like all rasa commands throws the same error. Even rasa --version

Error (including full traceback):

(rasa) F:\Projects\Testing\rasa>rasa init
Traceback (most recent call last):
  File "c:\programdata\anaconda3\envs\rasa\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\programdata\anaconda3\envs\rasa\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\ProgramData\Anaconda3\envs\rasa\Scripts\rasa.exe\__main__.py", line 4, in <module>
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\__init__.py", line 8, in <module>
    from rasa.run import run
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\run.py", line 7, in <module>
    from rasa.core.lock_store import LockStore
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\core\__init__.py", line 5, in <module>
    from rasa.core.train import train
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\core\train.py", line 11, in <module>
    from rasa.core.domain import Domain
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\core\domain.py", line 11, in <module>
    import rasa.utils.common as common_utils
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\utils\common.py", line 7, in <module>
    import rasa.core.utils
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\rasa\core\utils.py", line 27, in <module>
    from sanic import Sanic
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\sanic\__init__.py", line 2, in <module>
    from sanic.app import Sanic
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\sanic\app.py", line 18, in <module>
    from sanic.asgi import ASGIApp
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\sanic\asgi.py", line 22, in <module>
    from sanic.compat import Header
  File "c:\programdata\anaconda3\envs\rasa\lib\site-packages\sanic\compat.py", line 4, in <module>
    class Header(CIMultiDict):
TypeError: type 'multidict._multidict.CIMultiDict' is not an acceptable base type

Command or request that led to error:

rasa init, rasa --version, rasa --help. Looks like all of them

Content of configuration file (config.yml) (if relevant):

Content of domain file (domain.yml) (if relevant):

[bhavaniravi]

having the same issue MacOS, Python 3.7

Turns out it was an issue with sanic server's dependency multidict downgrading it helped me get rasa running

https://github.com/huge-success/sanic/issues/1729#issuecomment-564312966

[PilgrimViis]

@bhavaniravi thank you very much. It helped me as well.

[sara-tagger]

Thanks for the issue, @Ghostvv will get back to you about it soon!

You may find help in the docs and the forum, too 🤗

[mav1797]

having the same issue MacOS, Python 3.7

Turns out it was an issue with sanic server's dependency multidict downgrading it helped me get rasa running

huge-success/sanic#1729 (comment)

how can i do that?