dE0s is positive which should never happen

[dishu1]

Hello. I'm trying to calculate elastic constants of a series of organic crystals and here's what I get. It seems that the vc-relax routine is limited by 20 iterations maximum (which IMHO is unreasonable). What is the way around?

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    task #         0
    from bfgs : error #         1
    dE0s is positive which should never happen
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Input+Logs.zip