Notice: Undefined index: oauth_token in C:\xampp\www\classes\validate.class.php on line 382

Fatal error: Uncaught Abraham\TwitterOAuth\TwitterOAuthException: {"errors":[{"code":415,"message":"Callback URL not approved for this client application. Approved callback URLs can be adjusted in your application settings"}]} in C:\xampp\www\twitteroauth-master\src\TwitterOAuth.php:137 Stack trace: #0 C:\xampp\www\classes\validate.class.php(461): Abraham\TwitterOAuth\TwitterOAuth->oauth('oauth/request_t...', Array) #1 C:\xampp\www\validate.php(78): validateClass->twitter_login() #2 {main} thrown in C:\xampp\www\twitteroauth-master\src\TwitterOAuth.php on line 137