whats wrong with this code?

Hi! I inserted some code in the startup callback of the appdesigner (matlab 2018 b) and I am getting error:

Answer 1

[Image Analyst]

You called your app "app1" not "app" so you'd need app1.UIFigure.

However I think that all axes and widgets on your UI should be created with App Designer, not manually created by you during the startup.