Property setter was expecting a com.google.appinventor.components.runtime.Button component but got a IntNum instead. Note: You will not see another error reported for 5 seconds

Greetings, I'm a beginner in this software, can anyone please explain what went wrong thank you

Welcome to the community. I believe error caused because in when timer block you set button image of component to global first flip and global second flip which are numbers. Instead you should use button component , like Button1...

image

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