IE11 gets 404 error when accessing GWT application - Upgraded to GWT 2.6.1

Hello,

We have an GWT application that we upgraded from GWT 2.4 to GWT 2.6.1.

When I try to access the application with IE11, I get a 404 error, however I am able to bring up the application on IE8.

My app.gwt.xml for compilation lines are

<set-property name="user.agent" value="ie8"/>

<set-property name="user.agent" value="gecko1_8"/>

<extend-property name="user.agent" values="ie9,ie10,gecko1_8,opera" />

<extend-property name="user.agent" values="ie11" fallback-value="ie10" />

<property-provider name="user.agent" generator="com.google.gwt.useragent.rebind.UserAgentPropertyGenerator"/> 

Please help.

Thanks

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