I'm a bit stuck in adding a meta box custom field in oxygen page builder.
I've created a field called "Service Icon" with the id 'service_icon" in a group called "services".
I've then put the following code into an oxygen php block but it's not displaying anything on the front end.
rwmb_the_value( 'service_icon', array( 'size' => 'thumbnail' ) );
Am I doing it totally wrong?