Why would I index an IndexError: list index out of range. When the index of a list cannot be out of range?

I am creating a dice game, and when I got to the part where I assign images to each Tkinter label so that the dice are displayed, I started getting this error:

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python27\lib\lib-tk\Tkinter.py", line 1486, in __call__
    return self.func(*args)
  File "C:/Users/Logan/Desktop/Dice/dicelab2.py", line 56, in rollDice
    self.dice[i].roll()
  File "C:/Users/Logan/Desktop/Dice/dicelab2.py", line 35, in roll
    self.display.config(image=Photolist[self.value-1])
IndexError: list index out of range

      

        
        
        
      

    

Now the list contains 6 entries, and I call it from myself. cost. Self.value is assumed to be a random integer from 1 to 6. Before I name it, I subtract 1 so that it is in the Photolist index. What else could be causing this error? Here's my code:

import Tkinter
import random
Photolist=[]

class Die:

    def __init__(self,frame):        
        self.value = random.randint(1,6)
        print self.value
        photo1=Tkinter.PhotoImage(file="1.gif")
        photo2=Tkinter.PhotoImage(file="2.gif")
        photo3=Tkinter.PhotoImage(file="3.gif")
        photo4=Tkinter.PhotoImage(file="4.gif")
        photo5=Tkinter.PhotoImage(file="5.gif")
        photo6=Tkinter.PhotoImage(file="6.gif")

        Photolist=[photo1,photo2,photo3,photo4,photo5,photo6]

        self.display = Tkinter.Label(frame,
          image=Photolist[self.value-1],
          font=('Courier New',30),
          relief='ridge',
          borderwidth=5,
          bg='white')
        self.display.pack(side='left')

    def roll(self):
        self.value = random.randint(1,6)
        print self.value
        self.display.config(image=Photolist[self.value-1])

class DiceRoller:
    def __init__(self):
        gameWin = Tkinter.Tk()
        gameWin.title('Dice Roller')
        diceFrame = Tkinter.Frame(gameWin)
        self.dice = [ ]
        for i in range(5):
            self.dice.append(Die(diceFrame))

        rollBtn = Tkinter.Button(gameWin,
          text='Roll Again',
          command=self.rollDice,
          font=('Courier New',30)) 
        diceFrame.pack()
        rollBtn.pack(side='bottom')
        gameWin.mainloop()

    def rollDice(self):
        for i in range(5):
            self.dice[i].roll()


dice = DiceRoller()
dice