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