If the issue persists, I'd suggest restoring a different copy of your backup file. Make sure that the file is already on the local hard drive. If not yet, you can visit this article for detailed steps on how to transfer the file: Move your company files to another computer.
Once done, you can now restore the file by following the steps below:
Go to the File menu, then choose Open or Restore Company.
Select Restore a backup copy, then Next.
Pick Local Backup and tap Next.
Browse your company file (Your company name].qbb. ), then save the file to a new folder, and hit Open.