This could be caused by an addon using the center screen announcements wrong but I'm not sure.
The best possible way would be to track all addons of yours down which use the csa by searching all files for the string
CENTER_SCREEN_ANNOUNCE
(you can use the freeware text editor "Notepad++" for it:
Below the "Search" menu entry there is an entry "Search files" and you can specify a folder to search for, e.g. the AddOns directory, and search for *.lua file pattern).
Disable these addons one after another and see if this helps (error is gone).
If the error happens with ALL addons disabled you shoudl use the ingame command /bug and raise a bug report to the game developers.
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