Crashed when applied Toolbar

Question

I\'m new in Android programming. I\'m having this issue when I applied the toolbar into my app and it crashed when I try to run the app. Here is the code:

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Answer 1

You can see in your logcat output the answer:

Do not request Window.FEATURE_ACTION_BAR, set windowActionBar to false in your theme to use a Toolbar instead.

Also try using this link and this link

make sure you use this:

 false 

in your theme