spartan 3e error help me

Hi everyone i am using spartan 3e starter kit in its manuel gives UCF Location Constraints as like this:
NET "LED<7>" LOC = "F9" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<6>" LOC = "E9" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<5>" LOC = "D11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<4>" LOC = "C11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<3>" LOC = "F11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<2>" LOC = "E11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<1>" LOC = "E12" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<0>" LOC = "F12" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;

but when i add this to the ucf. file of my project it gives

ERROR:MapLib:30 - LOC constraint F9 on LED is invalid: No such site on the
ERROR:MapLib:30 - LOC constraint E9 on LED is invalid: No such site on the
ERROR:MapLib:30 - LOC constraint D11 on LED is invalid: No such site on the
ERROR:MapLib:30 - LOC constraint C11 on LED is invalid: No such site on the
ERROR:MapLib:30 - LOC constraint F11 on LED is invalid: No such site on the
ERROR:MapLib:30 - LOC constraint E11 on LED is invalid: No such site on the
ERROR:MapLib:30 - LOC constraint E12 on LED is invalid: No such site on the
ERROR:MapLib:30 - LOC constraint F12 on LED is invalid: No such site on the

Help me please i check family i enter at the first tons of time help me

1. Try for other pins in ucf and check that same problem is going on...
2. Clean your project files from 'Projects' tab and 'Clean Project File'...
3. Check the whole setting of FPGa family again...

These are my solutions