I'll give you the steps on how to resolve the error, LB1234.
Before we begin, it's recommended that QuickBooks is updated to the latest release. You also need to install and run the QuickBooks File Doctor for us to resolve the issue as quickly as possible.
Then, proceed to these steps:
Please let me know if you need more help with this. We'll make sure you're able to open the file and create a backup copy of it.