Fatal error: Uncaught exception 'Facebook\Exceptions\FacebookSDKException' with message 'Required "app_id" key not supplied in config and could not find fallback environment variable "FACEBOOK_APP_ID"' in C:\xampp\htdocs\stt_store\wp-content\plugins\nextend-facebook-connect\Facebook\Facebook.php:139 Stack trace: #0 C:\xampp\htdocs\stt_store\wp-content\plugins\nextend-facebook-connect\nextend-facebook-connect.php(161): Facebook\Facebook->__construct(Array) #1 C:\xampp\htdocs\stt_store\wp-content\plugins\nextend-facebook-connect\nextend-facebook-connect.php(123): new_fb_login_action() #2 [internal function]: new_fb_login('') #3 C:\xampp\htdocs\stt_store\wp-includes\class-wp-hook.php(298): call_user_func_array('new_fb_login', Array) #4 C:\xampp\htdocs\stt_store\wp-includes\class-wp-hook.php(323): WP_Hook->apply_filters('', Array) #5 C:\xampp\htdocs\stt_store\wp-includes\plugin.php(453): WP_Hook->do_action(Array) #6 C:\xampp\htdocs\stt_store\wp-login.php(418): do_action('login_init') #7 {main} thrown in C:\xampp\htdocs\stt_store\wp-content\plugins\nextend-facebook-connect\Facebook\Facebook.php on line 139