Compile error - help

Your variable is not called 'CountdownTimer', it is 'countdownTimer'. Java is case-sensitive.

I'm still receiving the same error - danpost

Delete your code and you wont receive any error

If you are getting this error in a class other than the SquareWorld class, you need to refer to it as 'SquareWorld.countdownTimer'

Winstrol - DO NOT POST ANY FURTHER MESSAGES TO GEEKYKID123!

But I am not receiving this error in a class other than SquareWorld class? So in the class SquareWorld its okay to refer to it as countdownTimer?

That would be ok. You were probably getting the error on line 29; where you call it 'countDownTimer', instead of 'countdownTimer'.