CAS System was unable to initialize: Tact instance creation failed

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1

Dear all,

since yesterday I have issues launching WoW (no problems on Sat / Sun).
I receive the following error message:
“The CAS system was unable to initialize: Tact instance creation failed.
Error(1): unknown failure.
Tact instance creation failed. Error (1): unknown failure”

I’ve tried: reseting WoW, using Scan and Repair and reinstalling the game, but the error persists. Is there anything else I can do?

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2

Same thing started happening to me today. Both retail and classic WOTLK are stuck in the update/scan loop and I get the same error as you when I try to launch WoW directly via WoW.exe

UPDATE: I reinstalled both retail and WOTLK classic, deleted the entire /WoW original folder that was still left after the uninstalls and now a newly installed WoW is working normally again. So give it a try if you have the same issue.
(Before this I basically tried all the possible blizz techical support fixes (deleting caches, connection troubleshooting etc.) and none of it worked)

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3

Amazing, that solution worked for me as well!

  • Uninstalled both retail and Wow Classic (didn’t even remember that I had installed that)
  • Deleted the WoW folder
  • Installed retail again :slight_smile:

Thank you for your help!

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4

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