Increasing Simulation Speed and Specialized Technology of SimPowerSystems

I read in SimPowerSystems's docs that I can increase simulation speed for that I must discretize my electric circuit and my control system. I tried to use the concurrent execution and model referencing but the compiler out many errors like: " This model is configured for concurrent execution and has modeling constraints. Block 'main/Asynchronous Machine SI Units/Electrical model/dq to abc transformation/Stationary reference frame/irb' of type 'Fcn' must be contained in a referenced model. " What do I wrong?