help me, i've a problem for click event

This my App Inventor programm (block and design) is it False ?)

But when I connect by Wifi or USB, the srcreen show me this : WHY ?

Can you help me please !!

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You have buttons that you made not visible in the design, I assume. Therefore you do not see them.

Your click events are really strange, because they make a button visible AFTER it is clicked, but you cannot click on an invisible button.
And what about the Bluetooth client? You set the character encoding before picking, while most people set the elements. And then, after you picked something you just disconnect?

I advise you to start with some tutorials!

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