Hello

Try to look at the references of the project (Open the project and you will find the folder reference)

An icon with a "!" would say than the reference have not been found. Then delete it (remenber the name of) and add a new reference (right click and add reference). Add CountryListBox by the Project tab. You can found others by accessing the COM tabs or Browse tabs if you don't found anywhere else. Try to pick your references on the bin folder of your dev website. Remember than the Dlls here are compiled in released mode. You can set up where your Dll is created by editing the project properties.

The error you get which says than the class SendNotification is obsolete isn't so important, it will be fixed on the next release and it work too. This message just says "The Core Dnn prefer use this class !" and that's a good idea to say it !

Hope i've helped

have a nice day

Sébastien