rem: this.warn('Missing reference element'); 
add:  this.warn('Missing reference element');  
context: qx.Proto.positionRelativeTo = function(el, offsetX, offsetY){  if (el instanceof qx.ui.core.Widget) {    el = el.getElement();  }  if (el) {    var gecko = qx.sys.Client.getInstance().isGecko();    var loc = qx.dom.DomLocation;    this.setLocation(loc.getClientAreaLeft(el) - (gecko ? qx.dom.DomStyle.getBorderLeft(el):0) + (offsetX || 0),      loc.getClientAreaTop(el) - (gecko ? qx.dom.DomStyle.getBorderTop(el):0) + (offsetY || 0));  } else {    this.warn('Missing reference element');      }}
meta: 1005	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1005/32797ee18a2c92a797417cb1392f24fa90943b97/Popup.js/clean/qooxdoo/frontend/framework/source/class/qx/ui/popup/Popup.js