problem in gnome with running on ubuntu 14

[Amir]

Hi,
i am a new member here, my name is amir. Hope everyone can accept me. My 
question is, i installed ubuntu unity desktop but then i installed gnome 
onto it. I used the gnome destkop, but i did upgrade (sudo apt-get 
upgrade), then canceled it (half way), but then when i did the upgrade 
again, it did but after that, i cannot open system setting on gnome. The 
problem report showed thtat, problem with gnome-control-center file. Any 
help? using ubuntu 14.04 gnome 3.12.2