Error using drawpolygon on UIAxes in MATLAB R2020b

I created a GUI using appdesigner in MATTLAB R2020a where I use the function drawpolygon to draw interactively on a UIAxes. This works fine.

However when I use MATLAB R2020b to run the GUI, it states following error when executing the drawpolygon function:

Undefined function 'drawpolygon' for input arguments of type 'matlab.ui.control.UIAxes'.

Error in NameFunction (line 43)

roi = drawpolygon(ax, 'Color','y','Tag','Outer limits');

As MATLAB R2020b has new features within other functions, I would like to use this version. How to solve this issue?

Additional information:

• Creation UIAxes in appdesigner
• Uploading image on UIAxes using GUI
• Drawing polygon on the image on UIAxes

[Bruno Luong]

Do you enter a valid licence with image processing toolbox while installing the 2020b?

[Glenn van Vugt]

Thanks for you remark, Bruno. Apparently image processing toolbox wasn't installed.

Now it works! :)