I am on Ubuntu 12.04.
I was running the Ubuntu customization kit but it disappeared with the following message: "The application zenity closed unexpectedly". When I further ran it, it just closed after selecting the language option. It was running well on previous Ubuntu versions and I made many remix of Ubuntu with the application.
Thanks for your time.
Zenity is lean tool for creating very simple GUI-Applications from the commandline.
Use zenity --help to see the options:
... and so on.
For example, if you issue the command:
displays a small dialog with a light bulb, an OK-Button, and the text "Just a Demo", try it yourself.
The usual way to do more useful things is, to capture the message, produced by zenity:
To your second question, why it failed: From the short message you reported, it can't be answered.