Zotero cannot be used in Word

The last time I used Zotero was six months ago. Now that I reopened the Word document and wanted to use Zotero, following massage came: "You could not communicate with zotero. Please ensure that Zotero ist running and try again."
Well, zotero IS running, everything is ok online, but I still cannot use ist in word.
Thankful for your help!
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