The old method mentioned in similar questions here is the following:
var editor = ace.edit(\"editor\"); var Range = ace.require(\'ace/range\').Range; editor.
seems like signature of the addMarker function was changed
addMarker
var Range = ace.require('ace/range').Range // get reference to ace/range ... editor.session.addMarker( new Range(1, 0, 15, 0), "ace_active-line", "fullLine" );`
works fine, see http://jsbin.com/acotuv/3/edit