将项目从MXML更改为AS错误

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<s:MobileApplication xmlns:fx=\"http://ns.adobe.com/mxml/2009\" 
                 xmlns:s=\"library://ns.adobe.com/flex/spark\"     firstView=\"view.LoginView\">
<fx:Declarations>
    <!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
</s:MobileApplication>`

package {
import spark.components.MobileApplication;
import view.LoginView;

[SWF(height=\"600\", width=\"1024\", frameRate=\"30\", backgroundColor=\"#FFFFFF\")]
public class Assessments extends MobileApplication{

    public function Assessments(){
        super();
        super.firstView = view.LoginView;
    }
}
}

TypeError: Error #1007: Instantiation attempted on a non-constructor.
at mx.preloaders::Preloader/initialize()[E:\\dev\\hero_private_beta\\frameworks\\projects\\framework\\src\\mx\\preloaders\\Preloader.as:258]
at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::initialize()[E:\\dev\\hero_private_beta\\frameworks\\projects\\framework\\src\\mx\\managers\\SystemManager.as:1977]
at mx.managers::SystemManager/initHandler()[E:\\dev\\hero_private_beta\\frameworks\\projects\\framework\\src\\mx\\managers\\SystemManager.as:2479]

package view
{
import flash.display.Sprite;
import flash.events.MouseEvent;
import net.airpoint.northgate.ui.components.AirpointNumericTextField;
import qnx.events.QNXApplicationEvent;
import qnx.system.QNXApplication;
import spark.components.Button;
import spark.components.Form;
import spark.components.FormHeading;
import spark.components.FormItem;
import spark.components.Label;
import spark.components.TextInput;
import spark.components.View;

public class LoginView extends View
{
    private var form:Form;

    private var usernameLabel:Label;
    private var usernameField:AirpointNumericTextField;
    private var passwordLabel:Label;
    private var passwordField:TextInput;
    private var submit:Button;

//  public var menu:AirpointAppMenu;

    public function LoginView()
    {

//      menu = new AirpointAppMenu();
//      QNXApplication.qnxApplication.addEventListener(QNXApplicationEvent.SWIPE_DOWN, showAppMenu);
        initializeUI();
    }

    public function showAppMenu(event:QNXApplicationEvent):void{
//      menu.show();

    }

    public function initializeUI():void{

        form = new Form();
        this.submit = new Button();
        this.submit.label = \"Login...\";
        form.defaultButton = this.submit;

        // Heading
        var fh:FormHeading = new FormHeading();
        fh.label = \"Login\";
        form.addElement(fh);

        // Username
        this.usernameField = new AirpointNumericTextField();
        var f1:FormItem = new FormItem();
        f1.label = \"Username\";
        f1.addElement(this.usernameField);

        // Password
        this.passwordField = new TextInput();
        this.passwordField.displayAsPassword =true;
        var f2:FormItem = new FormItem();
        f2.label = \"Password\";
        f2.addElement(this.passwordField);

        form.addElement(f1);
        form.addElement(f2);
        form.addElement(this.submit);
        this.addElement(form);

    }
}
}

package  {
import mx.events.FlexEvent;
import mx.styles.CSSStyleDeclaration;

import spark.components.Group;
import spark.components.MobileApplication;

import views.AssessmentsAppHome;

[SWF(height=\"600\", width=\"1024\", frameRate=\"30\", backgroundColor=\"#000\")]
public class AssessmentsApp extends MobileApplication{

    public function AssessmentsApp(){
        super();
        this.addEventListener(FlexEvent.APPLICATION_COMPLETE, onAppComplete);
    }

    private function onAppComplete(e:FlexEvent):void
    {
        this.removeEventListener(FlexEvent.APPLICATION_COMPLETE, onAppComplete);
        firstView = views.AssessmentsAppHome;
    }
}
}

<?xml version=\"1.0\" encoding=\"utf-8\"?>
<s:View xmlns:fx=\"http://ns.adobe.com/mxml/2009\" 
    xmlns:s=\"library://ns.adobe.com/flex/spark\" title=\"Home\">
<fx:Declarations>
    <!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:VGroup>
    <s:TextInput text=\"awdwdawd\"/>
</s:VGroup>
</s:View>

// Create a new instance of the display class and attach it to the stage
    if (showDisplay)
    {
        displayClass = new displayClassName(); 
        // Listen for when the displayClass no longer needs to be on the stage
        displayClass.addEventListener(Event.COMPLETE,                                     displayClassCompleteHandler);