Can't open Zotero standalone

Hi there - I am trying to open Zotero standalone and get the following error message...Then it won't open. Can anyone help please??

Thank you

Database upgrade error

[Exception... "Component returned failure code: 0x80630001 (NS_ERROR_STORAGE_BUSY) [mozIStorageConnection.executeSimpleSQL]" nsresult: "0x80630001 (NS_ERROR_STORAGE_BUSY)" location: "JS frame :: chrome://zotero/content/xpcom/db.js :: <TOP_LEVEL> :: line 149" data: no] [QUERY: DELETE FROM itemTypesCombined] [ERROR: database is locked]
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