Yes, you are doing something wrong.
This is script call is not setting any value to a parameter. What you are doing here is just CHECKING if the Custom Parameter ID 1 is higher than 0. (Also, a side note, don't do "$gameActors.actor(01)", do instead "$gameActors.actor(1)").
So what you need to do now is SET a value for the actor custom parameter 1.
And as stated before, you can set a value via script calls, plugin commands, or note tags.
if you already did that, show me a screenshot of your event using the plugin command or script call, or your note tag, etc.