Error message

Hello,
I used zotero for my English students. I have removed the groups from last year. I need to add new groups for my new classes, but, I receive this error message despite the fact that I have reinstalled zotero. Please advise. Thanks!


[JavaScript Error: "[Exception... "'Group with libraryID 288735 does not exist in Zotero.Groups.getGroupIDFromLibraryID()' when calling method: [nsITimerCallback::notify]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "<unknown>" data: no]"]
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