Problem with Regulating Transformer

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Hi I'm trying to simulate a power system which includes a voltage regulator and I'm using the block Three-Phase OLTC Regulating Transformer (Phasor Type) but I have some troubles with it, when I run simulation always have this error message:

"Complex signal mismatch. Output port 1 of 'model1/Three-Phase OLTC Regulating Transformer (Phasor Type)/Current Sources/Gain4' is a signal of numeric type complex. However, it is driving a signal of numeric type real"

I also have doubts about the correct way to take the measure of voltage to the input Vm.

I hope somebody can guide me with this or recomend me some other way to do the voltage regulation in my power system.

Thanks for your time, best regards.

Adriana