Fatal error: Uncaught Error: Using $this when not in object context in C:\xampp\htdocs\WAIT FOR DELETE\wp-content\plugins\case-theme-user\admin\html_tab_email.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\WAIT FOR DELETE\wp-content\plugins\case-theme-user\admin\html_tab_email.php on line 15