Hi Chang,

We have confirmed this issue for the standalone version on macos catalina 10.15.3. This might due to the compatibility bug of matlab compiler and macos catalina. We have posted this issue on the matlab forum: https://ww2.mathworks.cn/matlabcentral/answers/513689-mcc-error-with-uisetcolor-on-macos-catalina and look forward to get an answer. 

Currently, we have three alternative solutions for you. 

1) using a windows pc;

2) install a matlab on your mac;

3) we edited the color selection code, that you can input the RGB value instead of pick color squares from the GUI. please try the attached app. 

Best,
Mingrui



Originally posted by Jing Zhang: