How to delete library from Zotero server

Any know how to delete library from Zotero server?
I have tried to use blank zotero (local drive) to syn. zotero server but unsuccessful.
I also try to use a zotero (local drive) with 10 items to syn., but report error
[JavaScript Error: "uncaught exception: First and last name are empty in Zotero.Creator.save()"]

Anyone can help?
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