Getting an error 'Error: XrmServiceToolkit.Fetch: No 'entity' node in the provided FetchXML' from Internet Explorer. Works fine in Google Chrome

Hi,

I have a custom javascript method where I have FetchXML query that I am calling upon change on one particular field from the form and it works fine in the Google Chrome but fails in Internet explorer or Firefox giving below error:

Error: XrmServiceToolkit.Fetch: No 'entity' node in the provided FetchXML.

We are on Dynamics Online version. XRMToolkit.js that I have added in my library has below references

/// <reference path="XrmPageTemplate.js" />
/// <reference path="json2.js" />
/// <reference path="jquery.js" />

Wondering if it is to do with the version of the XRMToolKit library. If so, how and where do I get the compatible version that works for Dynamics Online.

Thanks In Advance.

Rekha