Fatal error: Uncaught Error: Class 'WP_CLI_Command' not found in /home/ioscotland/public_html/wp-content/plugins/cornerstone/includes/classes/cli/class-cli-headers.php:3 Stack trace: #0 {main} thrown in /home/ioscotland/public_html/wp-content/plugins/cornerstone/includes/classes/cli/class-cli-headers.php on line 3