ERROR: RESIDUAL IS TOO BIG -- REDUCING DELTA T
This error warns the user the residual is above the tolerance specified on the Analysis tab of the Analysis settings dialog. The simulation will reduce the time step and attempt to continue the simulation. If this process occurs more times than maximum number of cutbacks allowed, the simulation will abort.
ERROR: RESIDUAL IS TOO BIG
This is the final error message given when the maximum number of cutbacks allowed have been exceeded and the simulation is aborted.