Flash Error #1009: Cannot access a property or method of a null object referencee -

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my flash professional cc showing error simple alert code. have tried solve reading discussed on website unable solve it.

error :

typeerror: error #1009: cannot access property or method of null object reference. @ mx.controls::alert$/show()[/users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/alert.as:574] @ alerttest()[d:\summer project\practice\alerttest.as:7]

can suggest reason, here code!!

package { import flash.display.sprite; import mx.controls.alert;  public class alerttest extends sprite {     public function alerttest() {         alert.show("would exit application?", "confirm", alert.yes | alert.no | alert.cancel);         trace("hey");         }   } }

before getting error 1046 : type not found or compile time constant..

so installed flex skd 4.12.1 in folder , included library path in action settings fla file. after doing landed getting error.

kindly suggest.

the mx alert class flex framework , can't used in flash cc project.

with flex project can use alert class tried do. pure actionscript 3 project or flash cc project (there components available on flash cc no alert) have create own or can try find custom framework (i don't know maybe madcomponents?).


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