Fatal error: Uncaught Error: Class "League\OAuth2\Server\Grant\AbstractGrant" not found in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\league\oauth2-server\src\Grant\ClientCredentialsGrant.php:24 Stack trace: #0 {main} thrown in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\league\oauth2-server\src\Grant\ClientCredentialsGrant.php on line 24