I got the project from my team and i am working on it when ever i restart the system my Xcode not runs the project, but i am able to run other projects easily .... after i run the project with the changes i do it shows me

"Cannot run on the selected destination- The selected destination does not support the architecture for which the selected software is build. Switch to a destination that supports that architecture in order to run the selected software."
And if i run the original project it runs fine then i have to again copy and paste the codes that i did in the project after that it runs fine, but when i open my Mac the next day it does not runs and again i have to start from the original project, What is happening i don't know why after Restarting or Shut Down the project does not runs.

I am using Xcode 4.5.2 on iMac 21.5-inch - Software OS X 10.8.2 (12C60)(Mountain Loin)

Processor 2.5 Ghz Intel Core i5, Memory 4 GB 1333 MHz DDR3.

Project target is iOS SDK 6.0 (on iOS 6 simulator).

Does Not runs on Simulator and on Device also.

Sometimes just runs on the simulator but not on Device.

I have tried :
Restarting the Mac.
Cleared Derived Data.
Reinstalling Xcode.

But still can't figure out .. Nothing helps .. plz Help me on this ...