Flex :: Could Not Resolve <s:Method> To A Component Implementation

How do I do this in Flex 4?

<mx:RemoteObject id="srv" destination="product" channelSet="{channelSet}"
fault="faultHandler(event)">
<mx:method name="getProducts" result="getProducts_resultHandler(event)"/>
</mx:RemoteObject>

I got

Could not resolve <s:Method> to a component implementation.

When trying to do this

<s:RemoteObject id="roMajor"
destination="MajorSrv"
fault="Alert.show('Remote Object Error')" >
<s:Method name="AddMajor" result="roMajorResult(event)"/>
</s:RemoteObject>