Failed to modify some records error - CloudKit

I'm trying to share a record with other users in CloudKit but I keep getting an error. When I tap one of the items/records on the table I'm presented with the UICloudSharingController and I can see the iMessage app icon, but when I tap on it I get an error and the UICloudSharingController disappears, the funny thing is that even after the error I can still continue using the app.

Here is what I have.

Code

    var items = [CKRecord]()
    var itemName: String?

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let item = items[indexPath.row]
        
        let share = CKShare(rootRecord: item)


        if let itemName = item.object(forKey: "name") as? String {
            self.itemName = item.object(forKey: "name") as? String
            share[CKShareTitleKey] = "Sharing \(itemName)" as CKRecordValue?
        } else {
            share[CKShareTitleKey] = "" as CKRecordValue?
            self.itemName = "item"
        }
        share[CKShareTypeKey] = "bundle.Identifier.Here" as CKRecordValue
        prepareToShare(share: share, record: item)
    }


    private func prepareToShare(share: CKShare, record: CKRecord){
           
        let sharingViewController = UICloudSharingController(preparationHandler: {(UICloudSharingController, handler: @escaping (CKShare?, CKContainer?, Error?) -> Void) in


            let modRecordsList = CKModifyRecordsOperation(recordsToSave: [record, share], recordIDsToDelete: nil)


            modRecordsList.modifyRecordsCompletionBlock = {
                (record, recordID, error) in


                handler(share, CKContainer.default(), error)
            }
            CKContainer.default().privateCloudDatabase.add(modRecordsList)
        })


        sharingViewController.delegate = self


        sharingViewController.availablePermissions = [.allowPrivate]
        self.navigationController?.present(sharingViewController, animated:true, completion:nil)
    }


    // Delegate Methods:
    func cloudSharingControllerDidSaveShare(_ csc: UICloudSharingController) {
        print("saved successfully")
    }
    func cloudSharingController(_ csc: UICloudSharingController, failedToSaveShareWithError error: Error) {
        print("failed to save: \(error.localizedDescription)")
    }
    func itemThumbnailData(for csc: UICloudSharingController) -> Data? {
        return nil //You can set a hero image in your share sheet. Nil uses the default.
    }
    func itemTitle(for csc: UICloudSharingController) -> String? {
        return self.itemName
    }

ERROR

Failed to modify some records

Here is what I see...

https://i.stack.imgur.com/0SLlK.png

Any idea what could be wrong?