Catastrophic Failure Error

Caevynx_27  Please do a clean uninstall of the EA App using Revo Uninstaller (the free version is fine).  Use the Advanced scanning method when asked.  Restart your computer, download a fresh copy of the App installer, and run it as an admin: right-click the download and select "Run as administrator."

When the App is open, close it and restart your computer, then run Steam and the EA App themselves as an admin, and don't try to open Sims 4 until both launchers have loaded completely.