Same Program Runs Fine when ran from IDLE but not when ran directly

Question

I wrote a small Tkinter based GUI app on python. It worked fine when run with IDLE, but displays moduleError on running it directly. I am on windows. Running it directly means double-clicking the .py file. Here's the link to the code. I have the path to python appended in the PATH environment variable

http://codepad.org/ezxcpi7Y

And the error image:

Why i am getting that error? Please help

Answer 1

You need to import tkinter.messagebox

IDLE(writen in tk) imports this module in tkinter (python not imports modules twice).