What is a "Data IO operation System Error"?

[fervidflux]

Okay, for starters, i have made my own mod - and i have added new units and Civs.
Everything works fine, until i got to this point maybe 100 turns in, where the computer crashed, then when i tried to reboot, it claims "Data IO operation System Error:TILE", and boots me out of the game. I tried rebooting all the auto-saves as well, and still no dice. Interestingly, in the same mod, in a previous game, i got to around turn 200 or so, and it did the same thing, but, it did let me reboot auto-saves beyond 3 turns previously...
I just want to know why it is doing this, can it be fixed?
just so you know, all the new units work fine, and have been tested.

 

[ainwood]

Data IO: Tile normally refers to a corrupted save, although you might get it when trying to load a save from one version / patch of Civ into a different version / patch.