Continuing corruption error?

[71m07hySm17h]

Hi, I would like some help with mtm2 on a prob im having, I had the error, Unable to open SIT file, which means, I have a file that's podded that's corrupt. However, I found it, killed it, fixed MTM2. But whenever I try to add anything, even if its something I've had before, it recognizes it as corrupt.