Controller not a function, got undefined, while defining controllers globally

Question

I am writing a sample application using angularjs. i got an error mentioned below on chrome browser.

Error is

Error: [ng:areq] http://errors.

Answer 1

I just migrate to angular 1.3.3 and I found that If I had multiple controllers in different files when app is override and I lost first declared containers.

I don't know if is a good practise, but maybe can be helpful for another one.

var app = app;
if(!app) {
    app = angular.module('web', ['ui.bootstrap']);
}
app.controller('SearchCtrl', SearchCtrl);