var postWin = Titanium.UI.createWindow({
    url:'../javascripts/post.js',
    title:'New Update'
  }); 
  postWin.open({modal:true,animated:true});

var win = Titanium.UI.currentWindow;

var flexSpace = Titanium.UI.createButton({
        systemButton:Titanium.UI.iPhone.SystemButton.FLEXIBLE_SPACE
});

// create and add toolbar
var toolbar1 = Titanium.UI.createToolbar({
        items:[flexSpace],
        bottom:0,
        borderTop:true,
        borderBottom:false,
        translucent:true,
        barColor:'#999'
});     
win.add(toolbar1);

7 Answers

• One thing to remember is that when you do a full build Titanium removes unused components from their API. So if you are adding a new type of component, for example, there are no textAreas in your app, and then you add a textArea, you may get this error.

  The solution is to force a total rebuild by clearing out the contents of your build/iphone directory

• I had a similar issue, but discovered it was related to Titanium not knowing which modules to include in the build. As I was using Redux, calls such as Titanium.UI.createLabel were not detected by the Titanium builder and thus references to the Label UI module were not included. I wrote some code similar to this to solve the issue:

  (function() {
  var used = [
  Titanium.UI.createActivityIndicator,
  Titanium.UI.createWindow
  ];
  })();

• Any word on this, I have spent all day trying to run down this bug also

• Oh my days, not quite the same but similar. I am having Invalid method (createWindow) in simulator and cant even install onto device! Whats worse is that it was working last night when I left my development machine - untouched!

  Someone at appcelerator going to pitch in? Hope someone can spread some light on this!

• i made some progress, if i take the exact same project and put a new app.js in, it works fine… so now I need to see what is wrong with the code in the app.js

• I'm also having a similar issue with 1.5.0 and SDK 4.2, was working and now for an unknown reason it doesn't work, if i delete the build folder, run on simulator it works correctly, if i delete the build folder build for device it doesn't work on the device and when i attempt to view in the simulator it also no longer works.

  The errors are:

  [WARN] attempted to load: TiUITabGroupProxy
  [ERROR] Script Error = invalid method (createTabGroup) passed to UIModule at app.js (line 1).
  [ERROR] application received error: invalid method (createTabGroup) passed to UIModule at app.js (line 1)
  [DEBUG] application booted in 275.932014 ms

• I had a similar issue. I moved all code inside app.js to an include file app-window.js to solve this error

  Take a look on "SOLUTION?!" on this link http://developer.appcelerator.com/question/100971/get-crash-log-from-iphone#179941