Looks like ext-js issues migrating from GWT 1.7.0 to GWT 2.7.0. Need help.

Running my application using localhost.
When I open my application in IE using GWT 2.7.0, I have the following issues;

1. Application does not load initially as the IE Browser opens in IE 10 Compatability View Mode.
2. The application loads successfully once I change the Browser Mode to IE10. At this point if I CLICK on any items in the left navigation panel I am getting the below errors and looks like OnClick() of GWT is not working along with the ext-all.js issues.

Here is the ext-all.js issues I see in Console of IE10 browser;

SCRIPT5007: Unable to get property 'ui' of undefined or null reference
ext-all.js, line 100 character 1914
SCRIPT5007: Unable to get property 'ui' of undefined or null reference t-all.js, line 100 character 1954
SCRIPT5007: Unable to get property 'ui' of undefined or null reference
ext-all.js, line 100 character 1954
SCRIPT5007: Unable to get property 'ui' of undefined or null reference

Can someone please help me resolve these issues so that I can successfully migrate from GWT 1.7.0 to GWT 2.7.0 ?

Below is the screenshot of the IE10 browser Console;

Thanks a lot in advance.

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