Error plotting decision boundaries

Error using legend>process_inputs (line 554)

Invalid argument. Type 'help legend' for more

information.

Error in legend>make_legend (line 306)

[autoupdate,orient,location,position,children,listen,strings,propargs]

= process_inputs(ha,argin); %#ok

Error in legend (line 259)

make_legend(ha,args(arg:end),version);

Error in visualization (line 48)

legend(ax1, 'Rho',...

Error in demo (line 25)

visualization(model, traindata, testdata, rho, X1, X2,

para)