Qt multimedia query

I have installed QtMobility successfully but when I run my programs, the UI comes up but the media (audio & video) does not play. This is the error I get through command prompt as well as QtCreator:

*defaultServiceProvider::requestService(): no service found for – “com.nokia.qt.mediaplayer”
*

I got the same error when using QtSDK 4.8.1 & 4.7.2

My platform is Ubuntu 10.04 and gstreamer 0.10.6 is also installed on my platform

I am trying to run simple GUIs with simple media APIs for audio & video.(This GUI comes up but media doesnt play)
Solutions I tried: # Installing latest Gstreamer, # Moving multimedia plugins to QTSDK plugin folder.

These are the files in my QtSDK->plugin->mediaservice folder:

libqtmedia_audioengine.so & libqtmedia_v4lengine.so

Is the error related to absence of any .so files here