Help with custom trait

I'm making a custom reward trait that makes sims paint faster. But ran into a problem where the game crashes when I load up my save with the trait in my mods/packages folder. I have Scumbumbo's XML Injector and  I exported the trait from Mod Constructor V5. Are there any steps that I missed to ensure the trait works properly in game? I'm super new to making script mods and I have been following these tutorials, along with Sims ModelSimmer's Mod Constructor tutorials on YouTube.