Why am I getting the error "Please close ACE-BASE before launching" when starting Fortnite?

This error appears when Anti-Cheat Expert (ACE) is working in the background while you are launching Fortnite.

Please close ACE-BASE before starting the game

Anti-Cheat Expert (ACE) is not compatible with Fortnite and needs to be closed before starting the game.

Please follow the steps below to resolve the problem:

  1. Make sure to exit a game that might be using ACE before starting Fortnite.
  2. Perform a clean boot to load only essential programs: How do I create a clean boot for Fortnite?
  3. Locate the game that installed Anti-Cheat Expert and contact their support team for help turning off the service.
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