To prevent such a dialog from appearing again perform the steps suggested below:-
1) Open Internet Explorer (if not already opened)
2) Navigate to Tools -> Options
3) Click the Advanced tab in the Internet Options dialog box.
4) Scroll to the Browsing heading.
- Place a check mark by the item Disable Script Debugging (Internet Explorer).
- Place a check mark by the item Disable Script Debugging (Other).
- Remove the check mark by the item Display a Notification about Every Script Error.