AngularJS error: ‘argument ‘FirstCtrl’ is not a function, got undefined’

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You have 2 unnamed ng-app directives in your html.
Lose the one in your div.

Update
Let’s try a different approach.
Define a module in your js file and assign the ng-appdirective to it. After that, define the controller like an ng component, not as a simple function: 

<div ng-app="myAppName">  
<!-- or what's the root node of your angular app -->

and the js part: 

angular.module('myAppName', [])
    .controller('FirstCtrl', function($scope) {
         $scope.data = {message: 'Hello'};
    });

Here’s an online demo that is doing just that : http://jsfiddle.net/FssbL/1/

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