[Paul Watson]

Out of a sudden I'm always getting a 1010 error message when I go to save an invoice. What causes this and how can I fix it?

[COBS Tech Support]

A 1010 error usually indicates a network problem but in this because it's always happening in the same place, it's more likely to be related to damage to one or your table indexes.

(Because hardware/network problems tend to appear to be "random" in nature.)

Try running check disk on your server and doing an Automatic Repair afterwards to see if that repairs the file.