Develop TicTacToe game in Android Studio

This is the written process of me learning how to make a Tip Tac Toe game in Android Studio. 
This is the youtube video link learn from. Make by Tihomir RAdeff, pretty awesome video.

31 DEC 2016
After i follow through the whole video,  i receive below error.
So, i try to fix the error. What i learn from it:

1. Analyze->Inspect Code
Trust me, this would make things easier.

2. Android Studio are case sensitive.
I first declare as Button but later i write as button.

3. Unknown unit.
I carelessly write dp as dpi. I know. I know. No excuses. My damn graphic design mind auto correct the word. 
But then the programme recommend use sp, so i went with it.

2 JAN 2017
Now, i stuck here. I went through several time but i can't find what are the problem.


5:42 pm
I finally found out another error. I don't know why i type that bracket.


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