I'm trying to make an obstacle avoiding robot. So I've compiled the code but it shows " c:\program files (x86)\arduino\hardware\tools\avr/bin/avr-gcc-ar: cannot find binary 'avr-ar' ". Now I've no idea what to do. I've compiled it several times but it remains the same. I've opened a new sketch and just cut-paste my code and compiled it again. But it showed that same error massage. There is no other errors. So what to do??? 
So what to do???
Reinstall the IDE