According to Intuit, Error Code C=224 can occur when:
- backing up a company file (.qbw) from the File->Save Copy or Backup… menu selection
- running the Verify Data utility from the File->Utilities->Verify Data menu selection
- running the Rebuild Data utility from the File->Utilities->Rebuild Data menu selection
This has been resolved in the latest release of QuickBooks. To verify your QuickBooks release, from within QuickBooks press F2 to display the Product Information window. The Product shows both your version and release in the upper left corner.
For more information on Error Code C=224, consult this Intuit knowledge base article.