'Fatal error: Uncaught Error: Call to plugins my_custom_function()' . PHP_EOL; 'in /wp-content/plugins/myplugin/myplugin.php:20' . PHP_EOL; 'Stack trace:' . PHP_EOL; '#0 /wp-settings.php(409): include_once()' . PHP_EOL; '#1 /wp-config.php(90): require_once()' . PHP_EOL; '#2 /index.php(17): require("/wp-blog-header.php")' . PHP_EOL; '#3 {main} thrown in /wp-content/plugins/myplugin/myplugin.php on line 20';