how to use control chart to plot a single value

Hi , i'm trying to use the default controlchart of matlab but i face an Error every time i get a single value i plot, the result appear but with an error

% points is a vector of values 
% mylimits is LCL and UCL and mean 

    Chart = controlchart(points,'charttype', 'i','limits', mylimits,'width',1);

and i get this error each time i have to plot a single value

Error using set
Value must be a 1x2 vector of numeric type in which the second
element is larger than the first and may be Inf

Error in controlchart (line 362)
    set(allax,'xlim',[ind(1)-dx, ind(end)+dx]);

i'm still new to this so, i'm sorry if it's an irrelevant question !

i tried with using an 'xbar' type but i get even more errors !

thank you for your consideration

Best regards