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**TypeError: Error #2007: Parameter type must be non-null.**

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H!
 i'm new to the Development of Adobe Air Application.
 i am suck in this ERROR..If any buddy knows about this error then show me roads
 towards a  solution.


ERRoR is as Follow:

**TypeError: Error #2007: Parameter type must be non-null.**
     at flash.events::EventDispatcher/addEventListener()     at mx.validators::Validator/addTriggerHandler()[E:\dev\4.y\frameworks\projects\framework\src\mx\validators\Validator.as:805]     at mx.validators::Validator/set source()[E:\dev\4.y\frameworks\projects\framework\src\mx\validators\Validator.as:581]     at mx.binding::Binding/defaultDestFunc()[E:\dev\4.y\frameworks\projects\framework\src\mx\binding\Binding.as:282]     at Function/http://adobe.com/AS3/2006/builtin::call()     at mx.binding::Binding/innerExecute()[E:\dev\4.y\frameworks\projects\framework\src\mx\binding\Binding.as:485]     at Function/http://adobe.com/AS3/2006/builtin::apply()     at mx.binding::Binding/wrapFunctionCall()[E:\dev\4.y\frameworks\projects\framework\src\mx\binding\Binding.as:395]     at mx.binding::Binding/execute()[E:\dev\4.y\frameworks\projects\framework\src\mx\binding\Binding.as:333]     at mx.binding::Binding/watcherFired()[E:\dev\4.y\frameworks\projects\framework\src\mx\binding\Binding.as:511]     at mx.binding::Watcher/notifyListeners()[E:\dev\4.y\frameworks\projects\framework\src\mx\binding\Watcher.as:311]     at mx.binding::PropertyWatcher/eventHandler()[E:\dev\4.y\frameworks\projects\framework\src\mx\binding\PropertyWatcher.as:377]     at flash.events::EventDispatcher/dispatchEventFunction()     at flash.events::EventDispatcher/dispatchEvent()     at mx.core::UIComponent/dispatchEvent()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:13152]



Thanks,
JK Patel


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