[flexcoders] Error: Cannot invoke method

[babulj2003]

I get this error when trying to use Remote Object via AMF. The most
triffling thing is that there is not problem with the way code is
written and i cannot find any configuration issues. Moreover i do not
know how to get to the exact error. 
It is a simple code in which i am using a VO there's a corressponding
AS file which registers with the java VO. i have configured the
whitelist properly. i tried configuring NetConnectionDebugger the way
its given in Macromedia's site, but even that is not getting configured.

I cannot see anythin in the panel.

I have been into this weird problem for sometime now. I replicated the
code and tried to run it by building a seperate war, the same example
got executed. i want to know how to debug these kind of problems. Is
there any way to know the exact error. 

because "Error: Cannot invoke method 'methodName'"  doesn't help me in
any way.

Kindly respond soon.

i'm putting the code blocks here:

1. SimpleForm.mxml


<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.macromedia.com/2003/mxml";
initialize="initApp()">
        <mx:Script>
        import mx.managers.CursorManager;
        import mx.core.UIObject;
        import sample.data.*;
        
        var emp: Employee;
        var inputBlocker;

                function initApp() {
            emp=new Employee();
        }
        
        function update() {
            setBlockingCursor();
            //applyChanges();
                        emp.firstName=firstName.text;
            emp.lastName=lastName.text;
            srv.addEmployee(emp);
        }

        function addEmp_result(event) {
        
            setBlockingCursor();
        }
        
        function faultHandler(event) {
            removeBlockingCursor();
            mx.controls.Alert.show(event.fault.faultstring, 'Error');
        }
        function applyChanges(){
                emp.firstName=firstName.text;
                emp.lastName=lastName.text;
        }
           
        
        function setBlockingCursor() {
            inputBlocker = popupWindow(UIObject);
            CursorManager.setBusyCursor();
        }

        // Remove our blocking popup
        function removeBlockingCursor() {
            inputBlocker.deletePopUp();
            CursorManager.removeBusyCursor();
        }
        </mx:Script>
        
        
    <mx:RemoteObject id="srv" source="sample.data.SimpleService">
        <mx:method name="addEmployee" result="addEmp_result(event)"
fault="faultHandler(event)"/>
    </mx:RemoteObject>
        
                <mx:Form>
                                <mx:FormItem id="firstNameItem" label="First 
name" required="true" >
                                                <mx:TextInput  id="firstName" 
width="350" />
                                </mx:FormItem>
                                <mx:FormItem id="lastNameItem" label="First 
name" required="true" >
                                                <mx:TextInput  id="lastName" 
width="350" />
                                </mx:FormItem>
                                
                <mx:FormItem>
                    <mx:Button label="Add Employee" click="update()"/>
                </mx:FormItem>
                </mx:Form>
        
</mx:Application>

2. Employee.as

class sample.data.Employee {

    public var firstName : String;
    public var lastName : String;
    
    static var registered=Object.registerClass("sample.data.Employee",
sample.data.Employee);    

}

3. white-list
        <whitelist>
            <!-- whitelist config for unnamed objects -->
            <unnamed>
                <source>sample.*</source>
                <source>sample</source>
            </unnamed>
                <named>
                                        <object name="SimpleService">
                                            
<source>sample.data.SimpleService</source>
                                        <type>stateful-class</type>
                                        
<allow-unnamed-access>true</allow-unnamed-access>
                                        </object>
                                </named>        
        </whitelist>

4. SimpleService.java
package sample.data;

public class SimpleService{
        public void addEmployee(Employee emp){
                System.out.println("***********************************\n\n");
                System.out.println(emp.getFirstName()+" : "+emp.getLastName());
                System.out.println("\n\n***********************************");
                
        }               

}
5. Employee.java

package sample.data;

class Employee {
        private String firstName;
        private String lastName;
        
    public Employee(){
        }
        
        public Employee(String firstName, String lastName) {
                this.firstName = firstName;
                this.lastName = lastName;
        }

        public String getFirstName() {
                return firstName;
        }

        public void setFirstName(String firstName) {
                this.firstName = firstName;
        }

        public String getLastName() {
                return lastName;
        }

        public void setLastName(String lastName) {
                this.lastName = lastName;
        }
        

}









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