The problem was that although the document libraries were in the same site, even visually placed next to each other, one list had a path similar to this: https://blabla.sharepoint.com/sites/SiteName/Lists/ListName/Forms/AllItems.aspx and the other had a path: https://blabla.sharepoint.com/sites/SiteName/ListName/Forms/AllItems.aspx And because I was using the same path to access both libraries, this error occurred