kindafunnyloser This error is most commonly related to permissions. So if you use a third-party antivirus, please set exceptions in it for TS4_x64, TS4_DX9_x64, and TS4_Launcher_x64, or the entire Bin folder they're in. Set an exception for EADesktop.exe as well.
You may need to repair the game again.
If that doesn't help, please see the first post of this master thread for a different but related error:
[CURRENT ISSUE] Sims 4 already running | EA Forums - 11818313
Curryudon0818 I've merged your post with another thread about the same error. Please see the above.
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