error plotting smithchart by MATLAB manual

Hello i am trying to follow the steps in this manual

https://www.mathworks.com/help/rf/examples/designing-matching-networks-part-1-networks-with-an-lna-and-lumped-elements.html

when i follow the instructions as shown in the code bellow for plotting smithchart:

i get the following error

******************************************************************************

Error using rfdata.data/circle>check_nf_value (line 285)

Constant noise figure circles can be drawn only when

the specified object contains spot noise data.

Error in rfdata.data/circle (line 134)

check_nf_value(varargin{kk+1}, nfmin);

Error in rfckt.rfckt/circle (line 52)

[hlines, hsm] = circle(data, varargin{:});

Error in smith (line 4)

circle(unmatched_amp,fc,'Stab','In','Stab','Out','Ga',10:2:20,'NF',1.8:0.2:3,hsm);

*******************************************************************************************************

unmatched_amp = read(rfckt.amplifier, 'spp5.s2p');
fc = 5.2e9;
hsm = smithplot;
circle(unmatched_amp,fc,'Stab','In','Stab','Out','Ga',10:2:20,'NF',1.8:0.2:3,hsm);
legend('Location','SouthEast')