What does IndexOutofRangeException mean?

Question

It says that in my array that I have gone over the index. My program is a Number Guessing game played by 5 players (5 indexes). I have used arrays to create the object and p

Answer 1

It means that you are trying to access an index bigger than the array. In the line:

while(playedThisRound[index] == false)

You don't check the boundaries before using the index, and your crash is probably there.