- Opening a company file
- Running Reports
- Backing up
- Verifying/Rebuilding Company File
The C=224 error indicates that there is a transaction that is corrupt.
Perform a new Verify and Rebuild Data from withing QuickBooks -- instructions are here:
A quick workaround can be to hit "save and new" instead of just "save". No error will appear and normally you can go right back to the invoice.