/command failed with the error "dispatch_failed"

[karthi (yoyo)]

rasa run --port 5002 -m models --connector slack --credentials credentials.yml --endpoints endpoints.yml --log-file out.log --cors "*"  --enable-api --debug

Rasa Version      :         2.8.15
Minimum Compatible Version: 2.8.9
Rasa SDK Version  :         2.8.4
Rasa X Version    :         None
Python Version    :         3.8.2
Operating System  :         macOS-10.15.6-x86_64-i386-64bit

please help…