Argument count mismatch error: Expected 1, got 0.

Question

I am writing a datagridcolumn array to the cookie, and upon retreiving the user data it immediately throws "argument count mismatch error: Expected 1, got 0" on MediaGridColumnInfo(). I assume there is a disconnect between what I am saving and what is expected to receive.
this is how I am saving the array:
public function Save():void
            user.data.MediaListGridColumnsArray = new MediaGridColumnInfo(this.datagrid.columns);
            user.flush();
when I put a trace on user.data.MediaListGridColumnsArray.columnObject after saving, it shows the correct type [object datagridcolumn].
This is the entire MediaGridColumnInfo class (got this from another thread for solving storing typed object issue):
package digitalmedia.components.entities
    import flash.display.Sprite;
    import flash.events.*;
    import flash.net.SharedObject;
    import flash.net.registerClassAlias;
    import flash.utils.IDataInput;
    import flash.utils.IDataOutput;
    import flash.utils.IExternalizable;
    public class MediaGridColumnInfo implements IExternalizable 
        public var columnObject: Array;
        public function MediaGridColumnInfo(columnObject: Array)
            this.columnObject = columnObject;
        public function writeExternal(output:IDataOutput):void
            output.writeObject(columnObject);
        public function readExternal(input:IDataInput):void
            columnObject = input.readObject();
any ideas? thanks

Answer 1

I think you can't have required constructor parameters in objects that get
serialized.