Importing Flex 2.0 project from B2 to B3, mx.rpc.remoting:RemoteObject error

[o-r-b]

Hi. My project with (RemoteObject/AMF) was created and worked fine in B2 so i installed B3 release, import the project in B3 and i'we got: Definition mx.rpc.remoting:RemoteObject could not be found error.

1. Was my import proper or i have to do something else ( copy some .as or .swc files? or.....).

2. i even try to create new project and insert the code in, but no progress.

3. Any changes to the syntax of the interface or what?( i have searched in Flex:Beta_2_to_Beta_3_Changes, can't find solution)

Any help is highly appreciated. Thanks in advance.