Why can't I query CloudKit from Xcode or CloudKit Dashboard?

When I try to query CloudKit from CloudKit Dashboard, I get an error that says:

There was a problem querying the “Entry” type.

no auth method found

When I try to query the same records from code in Xcode, I get the error message from the error object in my queryCompletionBlock property of my query operation:

The operation couldn’t be completed. (CKErrorDomain error 4.)

Where do I find what error 4 means?

Here is the code that printed the error message in debug window:

    let predicate = NSPredicate(value: true)
    let query = CKQuery(recordType: DatabaseNameStrings.recordTypeEntry, predicate: predicate) // DatabaseNameStrings.recordTypeEntry = "Entry"
    let sortDescriptor = NSSortDescriptor(key: DatabaseNameStrings.recordFieldKeyCreationDate, ascending: true)
    query.sortDescriptors = [sortDescriptor]
    let queryOperation = CKQueryOperation(query: query)
    queryOperation.database = container.privateCloudDatabase
    queryOperation.desiredKeys = [DatabaseNameStrings.fieldNameText] // DatabaseNameStrings.fieldNameText = "text"
    queryOperation.recordFetchedBlock = {
        (record: CKRecord) in
        let entry = Entry(ckRecord: record)
        self.entries.append(entry)
    }
    queryOperation.queryCompletionBlock = {
        (cursor: CKQueryOperation.Cursor?, error: Error?) in
        if let error = error {
            print(error.localizedDescription) // The operation couldn’t be completed. (CKErrorDomain error 4.)
        } else {
            DispatchQueue.main.async {
                self.tableView.reloadData()
            }
            if let cursor = cursor {
                let innerQueryOperation = CKQueryOperation(cursor: cursor)
                innerQueryOperation.desiredKeys = queryOperation.desiredKeys
                innerQueryOperation.recordFetchedBlock = queryOperation.recordFetchedBlock
                innerQueryOperation.queryCompletionBlock = queryOperation.queryCompletionBlock
                queryOperationQueue.addOperation(queryOperation)
            } else {
                DispatchQueue.main.async {
                    self.tableView.reloadData()
                }
            }
        }
    }
    queryOperationQueue.addOperation(queryOperation)