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copied!<p>To answer the more general question: importing is the preferred way of including external files. In my opinion the <code>include</code> statement should be only used when nothing else will do as it makes things a bit more difficult to debug if something goes wrong and makes code usually more difficult to read and comprehend. Assaf's description of what <code>import</code> and <code>include</code> do is correct.</p> <p>And then for the more specific problem you seem to have: you're probably trying to do the <code>testing.init();</code> right there in the <code><script></code> block -- try putting it in a method. You should only have things like <code>import</code> statements and member declarations (variables, functions) directly in the script block and statements like this within functions.</p> <p>You're seeing that error message because when you're calling the <code>init()</code> method of this object, it hasn't been created yet -- that statement will be executed when the definition of the class that your MXML file represents is loaded; what you want is to have it executed when a particular instance of this class has been created, and you can do that by calling it in the constructor of the class (this is, as far as I know, not possible when you're writing a class using MXML, so read on:) or for example in a handler function for the <code>FlexEvent.CREATION_COMPLETE</code> (or <code>creationComplete</code> in terms of MXML tag attributes) event (see the example below.)</p> <p>Try something like this:</p> <pre><code><?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" width="800" height="600" creationComplete="creationCompleteHandler();" > <mx:Script> <![CDATA[ import lib.Journal; public var testing:Journal = new Journal(); private function creationCompleteHandler():void { testing.init(); } ]]> </mx:Script> </mx:Application> </code></pre>

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