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newbie dojo.data.ItemFileReadStore shows "error getting items" when assigned json data is from javascript

Hello,

I am trying to create dojo thumbnail using following syntax.

var mess = new Array();
                //getKfJasonData returns the pics in json format from javascript
                mess[0] = getKfJsonData();                 
                thmbData.data = mess[0];
                //I get correct output here in the alert
                alert ('data: ' + thmbData.data );

I am getting successful data items in alert and yet I get error in the console saying "error getting items" and I don't get any thumbnails. I get this error when I receive data from javascript method getKfJsonData().

When I assign my json data directly to variable, it works fine else not. Can someone please point out what am I missing here.

regards,
S