Help! Error starting Zotero

When I try to open Zotero, I get this message:
There was an error starting Zotero.

Error: Invalid field 'accessDate
_fieldCheck@chrome://zotero/content/xpcom/data/itemFields.js:426:13
Zotero.ItemFields</this.getLocalizedString@chrome://zotero/content/xpcom/data/itemFields.js:166:5
getLocalizedName@chrome://zotero/content/xpcom/data/searchConditions.js:654:14
Zotero.SearchConditions</this.init<@chrome://zotero/content/xpcom/data/searchConditions.js:578:23
From previous event:
ZoteroService@file:///Applications/Zotero.app/Contents/Resources/components/zotero-service.js:352:7
@chrome://zotero/content/include.js:4:14
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