Table of contents: creation impossible

Hi! I got an open office file with zotero zitations, I want to create a table of contents at the end of the document. It used to work. Not today: Mistake-message says something like: You have to ad a citation, before you can do this operation. Can you help me, please? ( I use the german version of Zotero.) Blessings, Frater Guerricus
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