Question Argument Out Of Range

Code (CSharp):

1.     public void PickPuzzle()
2.     {
3.         //string name = UnityEngine.EventSystems.EventSystem.current.currentSelectedGameObject.name;
4.  
5.         if (!firstGuess)
6.         {
7.             firstGuess = true;
8.             firstGuessIndex = int.Parse(UnityEngine.EventSystems.EventSystem.current.currentSelectedGameObject.name);
9.             firstGuessPuzzle = gamePuzzles[firstGuessIndex].name;
10.             btns[firstGuessIndex].image.sprite = gamePuzzles[firstGuessIndex];
11.             btns[firstGuessIndex].interactable = false;
12.         }
13.         else if (!secondGuess)
14.         {
15.             secondGuess = true;
16.             secondGuessIndex = int.Parse(UnityEngine.EventSystems.EventSystem.current.currentSelectedGameObject.name);
17.             secondGuessPuzzle = gamePuzzles[secondGuessIndex].name;
18.             btns[secondGuessIndex].image.sprite = gamePuzzles[secondGuessIndex];
19.             btns[firstGuessIndex].interactable = true;
20.  
21.             if (firstGuessPuzzle == secondGuessPuzzle)
22.             {
23.                 print("Puzzle match");
24.             }
25.             else
26.             {
27.                 print("Puzzle don't match");
28.             }
29.             StartCoroutine(checkThePuzzleMatch());
30.         }

giving me errors on

Code (CSharp):

1. secondGuessPuzzle = gamePuzzles[secondGuessIndex].name;

tried to solve it couldn't do anything

 

solved