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POHow to solve null object reference after instantiate FacebookSessionUtil
 

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  1. POHow to solve null object reference after instantiate FacebookSessionUtil
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    <p>I think you can help me out from this little problem.</p> <p>I am a novice in Facebook developer by choosing ActionScript 3 as my developer platform. I use SWC library from <a href="http://code.google.com/p/facebook-actionscript-api/" rel="nofollow noreferrer">official facebook-actionscript-api</a> that promoted by Adobe.</p> <p>So I followed their tutorial. So I did following instruction:</p> <ol> <li>Create Flex project.</li> <li>Download and put <code>Facebook_library_v3.4_flex.swc</code> to <code>\lib</code> in Flex project.</li> <li><p>Provide following code:</p> <pre><code> import com.facebook.Facebook; import com.facebook.utils.FacebookSessionUtil; private var fbook:Facebook; private var session: FacebookSessionUtil; protected var api_key : String = "my-facebook-app-api-key"; protected var secret_key : String = "my-facebook-app-secret-key"; public function init() : void { //fbook = new Facebook(); session=new FacebookSessionUtil(api_key,secret_key,this.loaderInfo); var fbook : Facebook = session.facebook; session.validateLogin(); } </code></pre> <p>After trying to run debug session. I got the error after execute this statement:</p> <p>session=new FacebookSessionUtil(api_key,secret_key,this.loaderInfo);</p></li> </ol> <p>I think I did something wrong but I couldn't figure it out. Could you help me by giving your advice or any guideline?</p> <p>This is exception I got:</p> <pre><code>TypeError: Error #1009: Cannot access a property or method of a null object reference. at com.facebook.utils::FacebookSessionUtil()[C:\Users\MikeHunt\Work\FacebookAPI\src\com\facebook\utils\FacebookSessionUtil.as:128] at CheeseZaa/init()[/Users/teerasej/Documents/Flex Builder 3?/freelance/CheeseZaa/src/CheeseZaa.mxml:24] at CheeseZaa/___CheeseZaa_Application1_creationComplete()[/Users/teerasej/Documents/Flex Builder 3?/freelance/CheeseZaa/src/CheeseZaa.mxml:4] at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.core::UIComponent/dispatchEvent()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\core\UIComponent.as:9440] at mx.core::UIComponent/set initialized()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\core\UIComponent.as:1168] at mx.managers::LayoutManager/doPhasedInstantiation()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\managers\LayoutManager.as:718] at Function/http://adobe.com/AS3/2006/builtin::apply() at mx.core::UIComponent/callLaterDispatcher2()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8744] at mx.core::UIComponent/callLaterDispatcher()[C:\autobuild\3.5.0\frameworks\projects\framework\src\mx\core\UIComponent.as:8684] </code></pre> <p>I notice that the first line of exception show this:</p> <pre><code>com.facebook.utils::FacebookSessionUtil()[C:\Users\MikeHunt\Work\FacebookAPI\src\com\facebook\utils\FacebookSessionUtil.as:128] </code></pre> <p>But I don't sure it involve in exception.</p> <p>My development platform is:</p> <ul> <li>Macbook Pro</li> <li>OSX Snow Leopard 10.6</li> <li>Flash Player 10.0.32 Debugger</li> <li>Mozilla Firefox 3.6</li> <li>Flex builder 3.2</li> <li>Flex SDK 3.5</li> <li>Facebook_library_v3.4_flex.swc</li> </ul> <p>Every suggestion and guideline would be thank you. I think this would be good for other developer that may found the same problem like me.</p>
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