Random placement of jigsaw puzzle

Hello, I'm trying to make a jigsaw puzzle game, here is my code for the random placement. It keep telling me that Array index out of range, i'm not sure what's wrong with the code. Any help is welcome

Thanks

PS: here is the code

public void RandomizePlacement() { //Debug.Log ("RandomizePlacement");

     VectorInt2[] puzzleLocation = new VectorInt2[2];
     Vector2[] puzzleOffset = new Vector2[2];

     do 
     {
         for (int i = 0; i < m_randomPases; i++)
         {
             puzzleLocation [0].x = Random.Range (0, (m_Size));
             puzzleLocation [0].y = Random.Range (0, (m_Size));

             puzzleLocation [1].x = Random.Range (0, (m_Size));
             puzzleLocation [1].y = Random.Range (0, (m_Size));

             puzzleOffset [0] = m_puzzle [puzzleLocation [0].x, puzzleLocation [0].y].GetImageOffset ();
             puzzleOffset [1] = m_puzzle [puzzleLocation [1].x, puzzleLocation [1].y].GetImageOffset ();

             m_puzzle [puzzleLocation [0].x, puzzleLocation [0].y].AssignImage (puzzleOffset [1]);
             m_puzzle [puzzleLocation [1].x, puzzleLocation [1].y].AssignImage (puzzleOffset [0]);
         }
     } while (CheckBoard() == true);
 }