Local store not working in Internet Explorer - Ext JS

Local store not working in Internet Explorer - Ext JS

I have a local store here that I put into my application. It works great
in Firefox but when I launch it in Internet Explorer(9), the entire app
crashes. Any idea?
Here's the code:
var filters_2 = Ext.create('Ext.data.Store', { //temp store
fields: ['field1'],
data : [
{ field1: 'Filter 1' },
{ field1: 'Filter 2' },
{ field1: 'Filter 3' }
]
});
Is there a require or something to that nature that I am missing? Any ideas?