New Stereo Install Help

I have a 2000 W-Reg Clio. At the moment it has the standard (Phillips)Radio/Cassette installed. I now have a Radio/CD stereo again its the standard Phillips make. The ones with tunerlist written on. When I attempted to install this, it has an ERROR which appears in the clock panel (where the code goes). I was hoping someone may have some information that may help me. Any help you can give will be appreciated. Thanks.