IE 8 not working for me with grails + extjs4

My application is pretty good in Forefox. But this does not work in IE 8.

Error ------

Webpage error details 

User agent: Mozilla / 4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident / 4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0, InfoPath. 2; Tablet PC 2.0) Signed: Sun, 13 Jan 2013 04:52:47 UTC

Message: 'isModel' is null or not an object Line: 21 Char: 452607 Code: 0 URI: ...: // localhost: 8088 / rdptpl / static / js / ext / ext-all.js

I do not know where my problem is. Help Pls .......

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This may be due to HTML5 features in IE. Here is a web page for checking the capabilities of html5 in browsers. Could you talk about the HTML5 features used in your ExtJS application.

ExtJS applications implement some HTML5 features, such as the Closable, WebSQL, local storage tabs, etc. ExtJS has alternative code for browsers to implement some of them with HTML5 features. Local storage and WebSQL cannot be implemented in Internet Explorer.

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