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Hello.. I am using PSSE to perform dynamic simulation, the simulation was working perfectly for me, but I tried to delete some sub-systems from the network, and in parallel I have deleted from .dyr file the corresponding dynamic data. After doing so, I had issue while running the dynamic in PSSE, where when I try to initialize the dynamic case, the PSSE crashes. could you please help me or at least state the possible causes for this problem. Note: I have deleted only the busses from particular subsystem along with corresponding dynamic data. I did not make any other changes.