Battle.net tried to perform an action that conflicts with a process already running. For example, uninstalling the game while actively playing it.
- Wait for the current process to complete, and try again.
- Close Battle.net and wait for Agent.exe to disappear from Task Manager before relaunching Battle.net. If the issue persists, restart your computer.
- This error may occur when the Battle.net Desktop App is required but not installed. Please download and install this application and test again.