IE error while accessing the page? - gwt

I have GWT application. i am using IE8. when i try to access the page in hosted mode, i am getting below error. how to resolve it?
Thanks!

IE6, IE7, IE8 has many bugs.
Try to compile your project in "Pretty" or "Detailed" javascript and look line where is error.
Then try to find in google this method. If you're lucky, you find solution.
It has helped me several times. But sometimes the errors GWT in IE are not resolved.

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Everything will work perfect, but if I refresh my page multiple times fast (CTRL + R in chrome) to clear my js-cache, for some reason it just crashes my file loading.
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Pastebin entire source code: http://pastebin.com/yjFWwqPv
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http://my.opera.com/hallvors/blog/2010/07/20/postmessage-s-targetorigin-and-security
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