Controlchart example from Help Not Working

When following the help example.

 Example:  Create X-bar and R control charts for the PARTS data.
        load parts
        st = controlchart(runout,'chart',{'xbar' 'r'});
I get the following error:

>> load parts

>> st = controlchart(runout,'chart',{'xbar' 'r'});

Error using range Too many input arguments. Error in controlchart>getstats (line 494) stats.range = range(X,2); Error in controlchart (line 239) stats = getstats(X,G,cctypes,distn,unit,width);