IE9 lacks jQuery plugin functionality. Object doesn't support property or method

I am only getting the following error in IE 9 Browser.

SCRIPT438: Object does not support property or method File: Knockout-3.1.0.js

Some of my JQuery Plugin methods are not loading in IE 9. I see that the jquery functions available in ____Proto____ DOM Elements in IE 10 are missing for DOM elements in IE9. I am using these jquery functions inside custom knockout binding handlers. I am using for example $(element).autosize()

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It works fine in IE 10, but not IE 9.