Hi Hellen Gong,
It sounds like you have been using AVM 2.0 style port connections which are not compatible with AVM 3.0 port connections. (By the way, the AVM 3.0 port connections are the only kind of connections that are supported in the OVM)
You did not give enough information about the errors you are getting for me to help you. Try attaching a small code sample we can compile.
Dave Rich