Qt project doesn't build successfully after updating the Qt Creator - Qt

Hi, I am working on this Qt application for symbian phones. I was using Nokia Qt sdk 1.2.1 and Qt sdk 4.7.3. The project was getting build just fine until I updated the QtCreator. I ran the updater which updated some 65 items. Now when I build the project, it has started giving error that “OviNotificationState” has not been declared. I have a variable OviNotificationState::State mState; After updating the sdk and APIs, this particular class seem to have gone obsolete or I don’t know. I cannot remove the updates now. Can somebody suggest possible solution in this case? Thanks