Fatal error: Uncaught ValueError: shell_exec(): Argument #1 ($command) cannot be empty in /home/timismor/public_html/ReTimeExistence.php:19 Stack trace: #0 /home/timismor/public_html/ReTimeExistence.php(19): shell_exec('') #1 {main} thrown in /home/timismor/public_html/ReTimeExistence.php on line 19