Cannot run the application in IE8

[Satakshi]

I have a project in EXT JS 4.0, which uses MVC architecture. Now I am trying to move that from 4.0 to 4.1.
The problem I am facing now is, the application is not at all running. It is giving the following errors:

Message: 'undefined' is null or not an object
Line: 54134
Char: 9
Code: 0

Message: The following classes are not declared even if their files have been loaded: ''. Please check the source code of their corresponding files for possible typos: '
Line: 9654
Char: 17
Code: 0

The code is giving at least a view (which is not the same with the previous version) in FireFox.

Please suggest.

[evant]

Check your code for trailing commas:

var foo = [a, b, c,]; // bad

Ext.define('Foo', {
    a: 1,
    b: 2,
    c: 3, // bad
});