Zotero Plug in file not valid

When I open MS word in my laptop, the zotero for word add ins tab suddenly disappear. I checked in the add ins menu, and its dissabled. I try to activate it manually via add ins menu, reinstall via setting->cite menu, even try reinstalling zotero, but nothing changes. Every time I want to activate the add in a comment pop up: "libzoteroWinWordIntegration.dll is not a valid Office add ins" and "Zotero.dotm is not a valid Office add ins".
What should I do?
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