Okay. I was able to run the action server with your code. I believe default port for action server is 5055. It gave output as below:
python -m rasa_sdk.endpoint --actions actions` ✔ 1459 14:18:21
2019-09-26 14:18:37 INFO rasa_sdk.endpoint - Starting action endpoint server… /Users/samrudha/anaconda3/envs/help_rasa/lib/python3.7/site-packages/rasa_core_sdk/init.py:12: UserWarning: The ‘rasa_core_sdk’ package has been renamed. You should change your imports to use ‘rasa_sdk’ instead. UserWarning, 2019-09-26 14:18:37 INFO rasa_sdk.executor - Registered function for ‘action_paper_search’. 2019-09-26 14:18:37 INFO rasa_sdk.endpoint - Action endpoint is up and running. on (‘0.0.0.0’, 5055)