Ok, well I have added to other lists with my custom code without issue, but turns out that I was loading jquery as below after you load jquery, thus causing a versioning issue.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
For reference, attached was the error I was receiving. Removed my reference to jquery and all is well.
Thanks for the prompt response.
Aaron
