This promblem occurs in AS3 when you’re sending and loading data through a URLrequest like this

var myData:URLRequest = new URLRequest(“http://www.mydomain.com/somescript.php”)
myData.method = URLRequestMethod.POST
var variables:URLVariables = new URLVariables()
variables.password = “somepassword”;
myData.data = variables
var loader:URLLoader = new URLLoader()
loader.dataFormat = URLLoaderDataFormat.VARIABLES
loader.addEventListener(Event.COMPLETE, dataOnLoad)
loader.load(myData)
function dataOnLoad(evt:Event){

trace (loader.data.someVar)

}

The variable if it is a string say comma delimited, will have no commas. It is because you didn’t send any variables ie you didn’t include the line in red.

Usually when you set up a button listener in actionscript 3 it listens for a mouse event and then fires a function. That functions needs to have the mouse event set as a parameter like this book now buttom function:

bookNow.addEventListener(MouseEvent.MOUSE_DOWN,setupBooking);

function setupBooking(event:MouseEvent){

//this is where the functions methods are written

}

The problem is that if I want to call that function from some other place in my code, like from within another function, ie.

setupBooking();

the error fires saying “expecting 1 argument but it received 0.”

The way around this is to declare the argument as null in the function definition, like this:

function setupBooking(event:MouseEvent=null){

}

then we can call it with or without an argument.

For any of you actionscript coders out there that may be searching for this. I discovered through trial and error that functions cannot be defined inside switches ie the following will not work

The code assumes there is a button on the stage called myButton

var myVar:String = “test”

switch(myVar){

case “test”:

myButton.addEventListener(MouseEvent.MOUSE_DOWN,doMyFunction); //this listener will be reported as null error #2007

function doMyFunction(event:MouseEvent){

trace (“function is working”);

}

}

You have to move the definintion of the function outside the switch like this:

var myVar:String = “test”

switch(myVar){

case “test”:

myButton.addEventListener(MouseEvent.MOUSE_DOWN,doMyFunction); //this listener is OK

}

function doMyFunction(event:MouseEvent){

trace (“function is working”);

}

This is not the same as the if-then statement function and so can be a trap for those who begin using switch statements to be concise. Hope it helps.