Target not created while using GNUARM

i installed cygwin and GNUARM 4.1,
then i open example Blinky under C:\Keil\ARM\GNU\Examples\

also set toolchain as told.

when i clik rebuild all target, the output window show:
Build target 'LPC2106'
assembling Startup.s...
Target not created

it seems GNUARM working, but the there's nothing in startup.o, just 0 byte length.

and i don't know why assembling Startup.s... followed by Target not created, how about the BLINKY.C?

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