[ALPS-users] Errors during DMRG simulations

I have been getting some errors during DMRG calculations lately. I think the only two that I have seen are: *** ERROR 1: Lanczos could not open vectors.dat and *** ERROR: Could not open file system.dat I'm using cygwin to run ALPS 1.3.3. Any ideas for what is causing these errors? The calculations continue in spite of these errors. Should I be worried about these errors causing inaccuracies in my calculations? Thanks, Justin