I have a website in drupal version 8.3.3 and since I installed oauth2 server module, I get the below error in Admin -> Reports -> Status Report
The OAuth2 server library is required for the OAuth2 module to function. Download the library using composer, downoad it from GitHub or use composer manager.
So I have added OAuth2 server library by running the below command
$ git clone --branch master https://github.com/bshaffer/oauth2-server-php.git
This command executed successfully and also the files are created in libraries directory. But still I get the same error
Note: I followed the instruction from https://www.drupal.org/node/1938218