[Solved] Notice: is_main_query was called incorrectly

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the solution is given in your error itself "use the WP_Query->is_main_query() method"–

try this –

if($query->is_main_query() && !empty($selected_sort_types) && empty($orderby)) {
        $_sort_types = array_keys($selected_sort_types);
        $orderby = $_sort_types[0];
        $query->set('orderby', $orderby);
    }

instead of this –

if(is_main_query() && !empty($selected_sort_types) && empty($orderby)) {
        $_sort_types = array_keys($selected_sort_types);
        $orderby = $_sort_types[0];
        $query->set('orderby', $orderby);
    }

2

solved Notice: is_main_query was called incorrectly