Hello, Belal,
1/ Add this code
// Enable WP_DEBUG mode
define( 'WP_DEBUG', true );
in wp-config.php file to enable the debug mode. Or contact your hosting provider and ask to do this.
It is simplest compare to installing and using 3rd party plugin.
2/ The theme is not responsible for the google search results, so we can’t assist you.
Create correct sitemap, roboots.txt file, maybe install SEO plugin for better optimization of your pages and then reindex your site.
Kind Regards,
8theme team