Hi,
You DS installation is not proper. While installing you have to select a repo and that repo should be used for logging in. It seems the DS you installed is not connected to the CMC and hence it will not work.
Check whether you have followed the same way as shown here -
http://scn.sap.com/community/data-services/blog/2012/11/27/data-services-40-sp1-installation
Arun