Sims 4 won't start because of 'missing or damaged files'

hi everybody, i'm new to this so pls help if im doing something wrong. anyways, my sims 4 won't start anymore. i downloaded it (legally, i paid like 40 bucks for it) from origin so when i want to play sims i have to go to origin and select sims 4 and click on play. however, it doesn't work anymore, see i get this (look @ the image i selected). it says that i have a platform missing or something. so my question is; does anyone know what i miss/might've deleted and if it will cost me money to get it back (bcs im broke rn). tysm