This is an error in the web page - not your concern at all (unless you developed it!)
You can disable the message. Assuming you use IE:
1. Within Internet Explorer select �Tools�, �Internet ptions�.
2. Select the �Advanced� tab.
3. Tick the option �Disable script debugging� under �Browsing�).
4. For the setting change to take effect close down all Internet Explorer windows and restart.