Error deleting file from Nextcloud

Hello, I’m having an issue with Joplin (a note-taking app) that synchronizes via Nextcloud.

Here’s the error I receive:
Error: DELETE locks/1_1_2b4879c1d59b48928088d5c64b7522ef.json: “Joplin/locks/1_1_2b4879c1d59b48928088d5c64b7522ef.json” is locked (Exception OCA\DAV\Connector\Sabre\Exception\FileLocked) (423): <?xml version="1.0" encoding="utf-8"?> <d:error xmlns:d=“DAV:” xmlns:s=“sabre/dav”> <s:exception>OCA\DAV\Connector\Sabre\Exception\FileLocked</s:exception> <s:message>“Joplin/locks/1_1_2b4879c1d59b48928088d5c64b7522ef.json” is locked</s:message> </d:error>

I believe this indicates that the file is locked on Nextcloud and Joplin can’t delete it. I tried going into my Nextcloud and deleting it manually but that did not work.

According to this Nextcloud forum post, this needs to be fixed at a level above basic users: File is locked - how to unlock - 📑 How to - Nextcloud community

Is it possible for an admin to manually unlock this file? I can’t synchronize my notes until it can be deleted.