arm_startup_nrf51.s could not be opened


I was copy template project from preinstalled folder to the desire one. When I opened program in new folder, the translate operation work fine. But when I pressed Build button I got following error:

startup_arm_nrf51.s: error: A1023E: File "........\Source\templates\arm\arm_startup_nrf51.s" could not be opened: No such file or directory.

Please help me.