Arduino: 1.6.10 Hourly Build 2016/05/25 09:33 (Windows 8.1), Board: "Arduino/Genuino Uno"

avr-g++: error: CreateProcess: No such file or directory

exit status 1
Error compiling for board Arduino/Genuino Uno.

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سلام کسی میدونه این ارور به خاطر چی هستش؟؟