Hi Aleksandr
Instead of:
number_sets = stress_op.outputs.fields_container.GetData().GetTimeFreqSupport().NumberSets
time_scoping.Ids = range(1, number_sets + 1)
Try this instead (don't use your number_sets at all):
timeScop.Ids = [i for i in range(1,model.TimeFreqSupport.NumberSets+1)]
Then add that timeScop to the result operators