  In mSUGRA model we assume that gravitino, the LSP, plays the role of cold
dark matter in the universe, while the lightest stau, the NLSP, catalyzes
primordial BBN reconciling the discrepancy between theory and observations. We
have taken into account all gravitino production mechanisms, namely decay from
heavy scalar fields, decay from the NLSP, and from the thermal bath. We find
that the dark matter constraint is incompatible with the lower bound on the
reheating temperature
