Npc Quest System Array Error

Ive got a script from a YouTube tutorial on how to make an NPC quest system. Ive done everything the same way that the guy in the video does, but I get an array error.

 GUILayout.Label(Questions[0]);
             GUILayout.Label(Questions[1]);
             
             if (GUILayout.Button(answerButtons[0])){
                 
                 ActivateQuest = true;
                 HasDoneQuest = false;
                 DisplayDialog = false;
                 enableMouse();
                 
             }
             
             if(GUILayout.Button(answerButtons[1])){
                 DisplayDialog = false;
                 enableMouse();
             }
         }
         
         if(DisplayDialog && ActivateQuest && HasDoneQuest){
             disableMouse();
             GUILayout.Label (Questions[2]);
             if(GUILayout.Button(answerButtons[2])){
                 QuestCompleted();
                 DisplayDialog = false;
                 enableMouse();
             
             }
         }

The second line is what it tells me has an error, but I'm not even sure how I am exceeding the bounds of the array....

Help would be appreciated.