Please help me. I am getting this error message.

"Component my_form:shuttle has invalid value expression eu.digitania.admingui.beans.Content@12c55e4"

Here is my code.

shuttle_demo.jsp

<f:view>
 <h:form id="my_form">
 <h:messages></h:messages>
 <rich:listShuttle id="shuttle"
 sourceValue="#{contentBean.allContent}"
 converter="listShuttleConverter" var="content" listsHeight="200"
 sourceListWidth="200" targetValue="#{contentBean.targetSelection}">

 <rich:column>
 <h:outputText value="#{content.contentId}"></h:outputText>
 </rich:column>
 <rich:column>
 <h:outputText value="#{content.title}"></h:outputText>
 </rich:column>

 </rich:listShuttle>
 <br />
 <br />
 <h:commandButton value="Process"
 action="#{contentBean.submitShuttle}"></h:commandButton>
 </h:form>
 </f:view>

ContentBackingBean
public class ContentBackingBean extends Content
{
private Set targetSelection;

public List getAllContent()
{
ContentDAOImpl contentDAOImpl = new ContentDAOImpl(MobileContentPortalDao.getSqlMapper());

List contentList = null;

try
{
contentList=contentDAOImpl.getAllContentByContenttype(6);
}
catch (SQLException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}

return contentList;

}


public String submitShuttle()
{
System.out.println("\n\n\n\n\n"+this.targetSelection.size()+"\n\n\n\n");
return "success";
}

public void setTargetSelection(Set targetSelection)
{
this.targetSelection = targetSelection;
}

public Set getTargetSelection()
{
return targetSelection;
}
}

converter

public class ListShuttleConverter implements Converter
{

 @Override
 public Object getAsObject(FacesContext context, UIComponent component, String value)
 {
 Content content = new Content();
 content.setTitle(value);
 System.out.println("Returning Content");

 return content;
 }

 @Override
 public String getAsString(FacesContext context, UIComponent component, Object value)
 {
 Content content= (Content)value;
 System.out.println("Returning Title");
 return content.getTitle();
 }

}