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DLTCHG is the flag for a variable step size in an extended term simulation. The line of code that you posted is saying that the model execution should end if you select extended term simulation mode with a fixed time step. Are you intending to use extended term simulation mode with a variable time step? That would be MIDTRM=1 and DLTCHG=1. If not, then you can remove all references to DLTCHG in your code, and try a compile in v33. You won't lose any relevant functionality.