Is this a runtime IE error? the script debugger option Specifies whether you want to turn off your script debugger. Script debuggers are used by Web site developers to test programs and scripts on their Web pages. The script error option Specifies whether to display the actual script errors when a page does not appear properly due to problems with its scripting.
1. Open Internet Explorer.
2. Click on Tools, then on Internet Options.
3. Click on the Advanced tab.
4. Look for the "Disable script debugging" line and put a check mark in the box.
5. Now look for the "Display a notification about every script error" line and remove the check mark in the box.