Thank you for sending a link to your file, your output, and the error message.
For the button issue, I saw that all of the buttons are made of invisible rectangles (rectangles with no fill and no stroke), but they have an Appear animation preset applied. Because they are invisible, they don't need the Appear animation. Once I set the animation to None, then the buttons worked.
For the error message, we've been getting reports from M1 Mac users about that error. It appears that the content is still being exported. If you want to prevent the error message from appearing, then you can turn off Image Optimization.
I hope that helps.