nCan you please provide more details of what you are trying to acheive? If there are no restart files available (.rnn is just a restart file coresponding to a substep in the base analsyis) check that your base analysis is solving correctly first.nThe error you have shown indicates that there are either no files available, which may indicate an error in your base analysis, or you are specifying the incorrect loadstep and substep from which to restart your analysis. Check the Ldstep keyword on the RESCONTROL command in the link I posted above. n