title: Cannot clear output text: tkinter.TclError: bad text index "0"
body: <p>When the following code is ran and the tkinter button is clicked; it produces the following error: </p>
  
  <pre><code>Exception in Tkinter callback
  Traceback (most recent call last):
    File "D:\Scypy\lib\tkinter\__init__.py", line 1699, in __call__
      return self.func(*args)
    File "D:\modpu\Documents\Python\DelMe.py", line 5, in click
      OutputBox.delete(0, END)
    File "D:\Scypy\lib\tkinter\__init__.py", line 3133, in delete
      self.tk.call(self._w, 'delete', index1, index2)
  _tkinter.TclError: bad text index "0"
  </code></pre>
  
  <p>For some reason the code successfully clears the text in the input box but fails to clear the text in the output box (it crashes instead).</p>
  
  <p>Any help for this would be appreciated, thank you.</p>
  
  <pre><code>from tkinter import *
  
  def click():
      MainTextBox.delete(0, END)  #This works
      OutputBox.delete(0, END) #This doesn't work
  
  GUI = Tk()
  MainTextBox = Entry(GUI, width = 20, bg = "white")
  MainTextBox.grid(row = 0, column = 0, sticky = W)
  Button(GUI, text = "SUBMIT", width = 6, command = click).grid(row = 1, column = 0, sticky = W)
  OutputBox = Text(GUI, width = 100, height = 10, wrap = WORD, background = "orange")
  OutputBox.grid(row = 4, column = 0, sticky = W)
  OutputBox.insert(END, "Example text")
  
  GUI.mainloop()
  </code></pre>