Remove Product Types and Virtual Product checkbox

Hi,

I was wondering how to remove Product types for Vendors in the WCFM.

Through the functions.php file in my child theme I have removed the products being visible in Woocommerce and it works site wide, apart from in the WCFM, so I guess I need to change something there too.

Also I want to remove the virtual product checkbox and I guess I can do that via the child theme too, but I am stuck since when I try and edit the wc_frontend_manager.php to add:

add_filter( ‘product_type_selector’, ‘remove_product_types’ );

function remove_product_types( $types ){
unset( $types[‘grouped’] );
unset( $types[‘external’] );
unset( $types[‘variable’] );
unset( $types[‘simple’] );

return $types;
}

It results in my site showing an error 500

Do you have any suggestions?

Kind regards,
Max