The API reference http://www.wikitude.com/external/doc/documentation/latest/titanium/referencetitanium.html starts with
"NOTE: All the following code snippets assume that there is a variable called wikitude that was created using the following line of code."
var wikitude = require('com.wikitude.ti');
But the most following code snippets are wrong, i.e.
You have to call these methods on the created Wikitude view
var arView = wikitude.createWikitudeView(...);
and then call
that is indeed a significant oversight. Thanks for bringing this up. I created an issue in our internal tracking system.
I think we will schedule this to be fixed very soon.