Errors #1772574161 and #722616325

Getting errors syncing this morning. Error message follows:
"[JavaScript Error: "Unexpected status code 403 for request 114825/NSW36VXQ in Zotero.Sync.Storage.Session.ZFS.downloadFile()" {file:"chrome://zotero/content/xpcom/storage/zfs.js line 265}

"[JavaScript Error: "[Exception... "A file sync error occurred. Please try syncing again."

Where "NSW36VXQ" appears above, it changes each time I try to sync.

I've closed and reopened FireFox and rebooted the computer. It didn't help.

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