This error is caused by bad patch data. There might not be something wrong on your end, but follow the steps below before contacting us.
If you're using a wireless connection, optimize your internet connection to rule out a connection issue.
Run the repair tool to repair any damaged game files.
Delete the Battle.net Tools folder to automatically rebuild outdated or corrupt files.
Update or temporarily uninstall any security programs, which may mistakenly identify the login module as a security threat.
If the problem persists, uninstall and reinstall the game.
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