# Exported Library Symbols refuse Constructor Parameters?

**URL:** <https://forum.kirupa.com/t/exported-library-symbols-refuse-constructor-parameters/267378>\
**Category:** flash\
**Created:** [July 31, 2008, 12:37pm UTC](https://forum.kirupa.com/t/exported-library-symbols-refuse-constructor-parameters/267378 "2008-07-31T12:37:01Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Ayman](https://avatars.discourse-cdn.com/v4/letter/a/dec6dc/32.png) [@Ayman](https://forum.kirupa.com/u/Ayman)\
**Post date:** [July 31, 2008, 12:37pm UTC](https://forum.kirupa.com/t/exported-library-symbols-refuse-constructor-parameters/267378/1 "2008-07-31T12:37:01Z")

</div>

Regarding exporting a movieclip asset in the library, to be used as a class through actionscript, say you have this class (taken from the help example) for a Circle movieclip in the library:

```auto
 
package 
{
    import flash.display.MovieClip;
    
    public class Circle extends MovieClip
    {
        public function Circle()
        {
        }
        
        public function getArea():Number
        {
            return Math.PI * Math.pow((width / 2), 2);
        }
        
    }
}

```

Now I want the Circle() constructor to take a parameter (so replaced the function with another one which takes a parameter).

```auto
 
public function Circle(x:Number)
        {
               trace(x);
        }

```

This has been causing me problems. In the linkage settings, when I chose the Class: DefaultCircle , and Base Class: Circle ,  
and in the maintimeline I put something like var myCircle = new DefaultCircle(1) it gives this error:  
1136: Incorrect number of arguments. Expected 0.

It basically does not want to take any other parameters for the constructor. It only works when I set the linkage settings to  
Class: Circle , and Base Class: flash.display.MovieClip , and change the code in the maintimeline to var myCircle = new  
Circle(1) . In this case it works. I want to know why the first scenario doesnt work!  
Thanks!