Rasa custom actions not running

Hi, everyone.

I am building a simple proyect RASA (3.1 version) just to learn how custom actions work (using linux). I came to know that I need to use rasa run actions in a different terminal, and to add that port to the endpoints file. When a use this command I get the following:

/home/xxxxxxxx/Escritorio/virtualenvs/rasavenv/lib/python3.8/site-packages/rasa/core/tracker_store.py:1042: MovedIn20Warning: Deprecated API features detected! These feature(s) are not compatible with SQLAlchemy 2.0. To prevent incompatible upgrades prior to updating applications, ensure requirements files are pinned to "sqlalchemy<2.0". Set environment variable SQLALCHEMY_WARN_20=1 to show all deprecation warnings.  Set environment variable SQLALCHEMY_SILENCE_UBER_WARNING=1 to silence this message. (Background on SQLAlchemy 2.0 at: https://sqlalche.me/e/b8d9)
  Base: DeclarativeMeta = declarative_base()
2023-07-03 22:17:53 INFO     rasa_sdk.endpoint  - Starting action endpoint server...
2023-07-03 22:17:53 INFO     rasa_sdk.executor  - Registered function for 'action_hello_world'.
2023-07-03 22:17:53 INFO     rasa_sdk.endpoint  - Starting plugins...
2023-07-03 22:17:53 INFO     rasa_sdk.plugin  - No plugins found
Traceback (most recent call last):
  File "/home/oscargarcia/Escritorio/virtualenvs/rasavenv/lib/python3.8/site-packages/rasa_sdk/plugin.py", line 26, in _discover_plugins
    import rasa_sdk_plugins
ModuleNotFoundError: No module named 'rasa_sdk_plugins'
2023-07-03 22:17:53 INFO     rasa_sdk.endpoint  - Action endpoint is up and running on

despite the errors, it seems that the port is active, right? the problem is that it still doesn’t work. I add the following in the endpoints file action_endpoint: url: "" but still, when trying to trigger the action in another terminal with rasa shell, I get

  File "/home/xxxxxxxxx/Escritorio/virtualenvs/rasavenv/lib/python3.8/site-packages/rasa/core/actions/action.py", line 788, in run
    response: Any = await self.action_endpoint.request(
  File "/home/oscargarcia/Escritorio/virtualenvs/rasavenv/lib/python3.8/site-packages/rasa/utils/endpoints.py", line 175, in request
    raise ClientResponseError(
rasa.utils.endpoints.ClientResponseError: 500, Internal Server Error, body='b'{"error":"Requested URL  not found","request_body":null}''

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/oscargarcia/Escritorio/virtualenvs/rasavenv/lib/python3.8/site-packages/rasa/core/processor.py", line 957, in _run_action
    events = await action.run(
  File "/home/oscargarcia/Escritorio/virtualenvs/rasavenv/lib/python3.8/site-packages/rasa/core/actions/action.py", line 818, in run
    raise RasaException(
rasa.shared.exceptions.RasaException: Failed to execute custom action 'action_hello_world'```

How can I solve this?
Is rasa_sdk_puglings the problem? 
Am i using the wrong port?

Thanks everyone!

Well, I was using a wrong port: correct one is “http://localhost:5055/webhook”.