Is this plugin doing something to the WP_Query?

I would like to have the posts ordered by WPeddit. I understand, that it is wpeddit_order.

this is the code the developer asks to add to the functions.php:

//code for changing the custom post order
function wpeddit_order($query) {
		global $wp_query;
		if ( ! $query->is_main_query() )
	    return $query;

	      if(!is_page() || !is_admin()){
	      	if(is_main_query()){
				$query->set('meta_key', 'epicredrank');
		  		$query->set('orderby', 'meta_value_num');
		  		$query->set('order', 'DESC');
			}
	      }
		return $query;
}
add_action('pre_get_posts','wpeddit_order');

After adding this, the grid ends in 404.

Is there a way to get your plugin working with WPeddit?

For another user who asked why WPeddit isn’t working, the author answered:
“Your theme may do something itself with the WP_Query which WPeddit uses.”

Hi,
Content Views plugin uses WP_Query to acquire posts list.

Can you tell me what is error message in Grid view?