After updating from 7.4.2 to 8.4 the Page management functions do not load.

If we click on a page we do not get the page properties panel to show, or add a page, etc. 

There is a Uncaught TypeError: Cannot read property 'length' of undefined

page bugs out in this function.

var loadScriptInMultipleMode = function(){

    for(var i = 0; i < window.dnnLoadScriptsInAjaxMode.length; i++){

        var s = document.createElement( 'script' );

        s.type = 'text/javascript';

        s.src = window.dnnLoadScriptsInAjaxMode[i];

        s. = window.dnnLoadScriptsInAjaxModeComplete;

        s. = window.dnnLoadScriptsInAjaxModeComplete;

        document.body.appendChild(s);

    }