atesdanis

wc_reserved_stock table was existing in db but woocommerce was not able see it.
as you said I changed prefix to lowercase in wp-config.php and also in database table rows, error message disappeared.

thank you @drwpcom

Thank you Jesin A, your first answer working well (Y)

1) edit this file theme-woocommerce.php (includes/theme-woocommerce.php)
2) find it “function mystile_product_categories() {“

3) copy these lines

add_filter( 'mystile_homepage_product_categories_params', 'homepage_parent_categories_only' );
function homepage_parent_categories_only( $params ) {
    $params = 'parent="0"';
	return $params;
}

4) paste it after line that you found in item 2
5) Save