Getting error when creating access token :- {"error": "invalid_client"}

I perform below steps to create an access token. but getting error {"error": "invalid_client"}

1. go to this link http://<ip_address>:/o/applications/

2. fill form to register your application

3. enter below command in CMD

curl -X POST -d "grant_type=password&username=<user_name>&password=" -u"<client_id>:<client_secret>" http://<ip_address>:/o/token/

4. Also, I installed required libraries for access token help of this https://django-oauth-toolkit.readthedocs.io/en/latest/rest-framework/getting_started.html

5. Image of error attached below Error I am getting