The hangman Game

Game.java

public class Game { public static final int MAX_MISSES = 7; private String mAnswer; private String mHits; private String mMisses;

private char validateGuess(char letter) { if (! Character.isLetter(letter)) { throw new IllegalArgumentExecption("A letter is required"); } letter = Character.toLowerCase(letter); if(mHits.indexOf(letter) >= 0 || mMisses.indexOf(letter) >=0) { throw new IllegalArgumentException(letter + "has already been guessed"); } return letter; } public Game(String answer) { mAnswer = answer; mHits = ""; mMisses = ""; } public boolean applyGuess(char letter) { letter = validateGuess(letter); boolean isHit = mAnswer.indexOf(letter) >= 0; if (isHit) { mHits += letter; } else { mMisses += letter; }
return isHit; } public String getCurrentProgress() { String progress = ""; for (char letter: mAnswer.toCharArray()) { char display = '-'; if (mHits.indexOf(letter) >= 0) { display = letter; }
progress += display; } return progress; } public int getRemainingTries() { return MAX_MISSES - mMisses.length(); }
}

Picked up JAVA_TOOL_OPTIONS: -Xmx128m
Picked up _JAVA_OPTIONS: -Xmx128m
./Game.java:9: error: cannot find symbol
throw new IllegalArgumentExecption("A letter is required");
^
symbol: class IllegalArgumentExecption
location: class Game
1 error

Why I get this error everything seems right I checked the video as well