Getting "Method 'sign_in' does not exist" Error (using Charles)

Question

This may be a bit off the FLEX field, and have to do with Zend Framework's ZEND_AMF class. Unfortunately I haven't been able to dig anything up, and comments posted on Wade Arnolds site have not received any responses, so I thought I'd give it a go here.
My ServiceController Class:
public function loginAction()
     $this->_helper->viewRenderer->setNoRender();
     $server = new Zend_Amf_Server();
     $server->setClass('LoginAmfService', 'LoginService');
     $server->setClassMap('CurrentUserVO', 'CurrentUserVO');
     $server->setProduction(false);
     print($server->handle());
My LoginAmfService class:
class LoginAmfService
      * Main login function.
      * @param  string        $name
      * @param  string        $password
      * @return CurrentUserVO
     public function sign_in($name, $password)
          $authAdapter     = new Zend_Auth_Adapter_DbTable(Zend_Registry::get('db'), 'users', 'user_name', 'password', 'PASSWORD(?) AND active = 1');
          $returnValue     = new CurrentUserVO();
          $authAdapter->setIdentity(htmlspecialchars($name))
               ->setCredential(htmlspecialchars($password));
          $authResult = $authAdapter->authenticate();
          if ($authResult->isValid())
               $userArray                          = $authAdapter->getResultRowObject(array('id', 'first_name', 'last_name', 'title', 'photo'));
               $returnValue->first_name     = $userArray->first_name;
               $returnValue->last_name          = $userArray->last_name;
               $returnValue->title               = $userArray->title;
               $returnValue->photo               = $userArray->photo;
               $returnValue->token               = $userArray->id;
          return $returnValue;
      * Function used to log people off.
     public function sign_out()
          $authAdapter = Zend_Auth::getInstance();
          $authAdapter->clearIdentity();
My SignIn FLEX module (the relevant portions):
     <mx:RemoteObject
          id="LoginRemote"
          destination="login"
          source="SignIn"
          showBusyCursor="true"
          fault="parentDocument.handleFault(event)"
     >
           <mx:method name="sign_in" result="signin_handle(event)" />
           <mx:method name="sign_out" result="signout_handle(event)" />
     </mx:RemoteObject>
     <mx:Script>
          <![CDATA[
               import mx.rpc.events.FaultEvent;
               import mx.utils.ArrayUtil;
               import mx.rpc.events.ResultEvent;
               import mx.controls.Alert;
               import com.brassworks.ValueObjects.CurrentUserVO;
               import mx.events.VideoEvent;
               [Bindable]
               private var this_user:CurrentUserVO = new CurrentUserVO();
               private function mdl_init():void
                    focusManager.setFocus(txt_username);
               private function signin_handle(event:ResultEvent):void
                         this_user = event.result as CurrentUserVO;
                         if (this_user.token == null) {Alert.show("Supplied login credentials are not valid. Please try again.");}
                         else
                              this.parentApplication.setUser(this.this_user);
               private function signout_handle(event:ResultEvent):void
               private function sign_in(event:Event):void
                    try
                         //Alert.show(txt_name.text + "|" + txt_password.text);
                         LoginRemote.sign_in(txt_username.text, txt_password.text);
                    catch (error:Error)
                         this.parentDocument.handleFault(error);
               private function sign_out(event:Event):void
               private function show_error(error:Error, s_function:String):void
                    Alert.show("Method:" + s_function + "\nName: " + error.name + "\nID: " + error.errorID + "\nMessage: " + error.message + "\nStack Trace: " + error.getStackTrace() + "\nError: " + error.toString());
               private function handleFault(event:FaultEvent):void
                    Alert.show(event.fault.faultDetail, event.fault.faultString);
          ]]>
     </mx:Script>
Now, all this is great and good, as it works with Zend Framework 1.7.6. However, when I try to upgrade to 1.7.8 (to take advantage of session management and other bug-fixes), I get the following error (using Charles):
#1 /var/web/htdocs/core/library/Zend/Amf/Server.php(390): Zend_Amf_Server->_handle(Object(Zend_Amf_Request_Http))
#2 /var/web/htdocs/core/application/default/controllers/ServicesController.php(73): Zend_Amf_Server->handle()
#3 /var/web/htdocs/core/library/Zend/Controller/Action.php(503): ServicesController->loginAction()
#4 /var/web/htdocs/core/library/Zend/Controller/Dispatcher/Standard.php(285): Zend_Controller_Action->dispatch('loginAction')
#5 /var/web/htdocs/core/library/Zend/Controller/Front.php(934): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#6 /var/web/htdocs/core/application/bootstrap.php(39): Zend_Controller_Front->dispatch()
#7 /var/web/htdocs/core/public/index.php(5): Bootstrap->runApp()
#8 {main} ?Method "sign_in" does not exist
I have no idea why this would not work anymore. My assumption is that I am not correctly setting up Zend_Amf (but then again, my counter-argument is that it worked before, so ..... ????)
Thanks for any help!
-Mike

Answer 1

For those that are also fighting this issue:
The problem appears to be that the RemoteObject needs to specify the class containing the methods as a source parameter. According to this bug report (http://framework.zend.com/issues/browse/ZF-5168) it is supposed to have been addressed, but apparently has re-emerged in Zend_Amf since version 1.7.7.
Using my example above, I would have to specify the RO as:
<mx:RemoteObject
          id="LoginRemote"
          destination="login"
          source="LoginAmfService"
          showBusyCursor="true"
          fault="parentDocument.handleFault(event)"
     >
           <mx:method name="sign_in" result="signin_handle(event)" />
           <mx:method name="sign_out" result="signout_handle(event)" />
     </mx:RemoteObjecct>