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Navigating problems

AlexT123

Lurker
Hi everyone,

I am trying to navigate from the main activity to activity 2 using "button1" but I got the causions like this.

I am a starter so I do not know what was wrong with my codes although I did the same thing as guided on Youtube.

Could you tell me what to solve?

Thank you for your time!
upload_2020-7-21_16-37-59.png
 
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