Muhammad,
What is the exact error message you are getting?
We did update the Concerto support in CCS to support additional revisions, so you might want to download the latest version of CCS (v6.0), and see if the XF28M36P63C2Z device is supported. Unfortunately, I don't really know the difference between the C2T and C2Z devices, so it might also make sense to start a different post in the C2000 section of the forums to try to find out the difference between the devices.
Thanks,
Ricky