RooFit tutorial rf203_ranges.C crash at line "model.plotOn(frame, Range(""), LineStyle(kDashed), LineColor(kRed));"

Hallo. I am new in RooFit and I am studying the tutorials.
In the tutorial rf203_range.C the execution crashes at line

model.plotOn(frame, Range(""), LineStyle(kDashed), LineColor(kRed));
It does not crash if I put “signal” inside Range(“signal”):
model.plotOn(frame, Range(“signal”), LineStyle(kDashed), LineColor(kRed));

Thank you for help.

@moneta can help you with roofit matters.