JS error in IE 9 & IE 10

Hi,
We are seeing a JS error (screenshot of the error attached) which is preventing the page from rendering. It is only happening on IE 9 & IE 10. Chrome and FF work fine. Can you please take a look at the error in the attached screenshot and let us know what might be the cause of this error? Here is the desired information:

1. SmartClient Version: SC_SNAPSHOT-2011-12-05/Pro Deployment (built 2011-12-05)

2. IE 9 & IE 10

Thanks!

Attached Images

JS_Error.JPG (64.4 KB)