Facebook PHP throwing exception (#803) - facebook-php-sdk

Fatal error: Uncaught OAuthException: (#803) Cannot query users by their username (naitik) thrown in C:\xampp\htdocs\facebook-php-sdk-master\src\base_facebook.php on line 1325
please help me to slove this problem...

Just in case if you didn't understand what Hobo Sapiens was saying, your error is because you use username to query.
To be able to query you must use an id... user-id/page-id/post-id/ etc.
Good luck with learning!

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