The exception occurrs somewhere in a constructor where a panel is created. At the moment it would be of help, if I could see how the source is translated into JS. But IE shows only the code from the host page. No idea how to update it.
Compile your app in PRETTY or DETAILED mode so that your Java method/class/package names won't be obfuscated in the final JS and then the exception text should already give you a strong hint where things go wrong.
In IE Developer Tools you need to hit the small refresh button.
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