Causes fatal error on activation and api settings are not available under Settings menu.

An error of type E_ERROR was caused in line 69 of the file /public_html/wp-content/plugins/checkoptimization/admin/partials/checkoptimization-seo-analyzer.php. Error message: Uncaught Error: Call to undefined function ereg() in /wp-content/plugins/checkoptimization/admin/partials/checkoptimization-seo-analyzer.php:69