not defined properties

[sambriggs172]

When trying to set it up, I keep getting;

Uncaught TypeError: Cannot set property 'X2JS' of undefined
at xml2json.js?ver=5.0:1
at xml2json.js?ver=5.0:1

xmlfeed.js?ver=all:1
Uncaught ReferenceError: X2JS is not defined
at HTMLDocument. (xmlfeed.js?ver=all:1)
at i (jquery.js?ver=1.12.4:2)
at Object.fireWith [as resolveWith] (jquery.js?ver=1.12.4:2)
at Function.ready (jquery.js?ver=1.12.4:2)
at HTMLDocument.K (jquery.js?ver=1.12.4:2)

When I try to move areas around to make sure the scripts are positioned correctly in the header or footer, it breaks my jQuery scripts.