hi iam getting this error while uploading.please guide me what should i do now
Arduino: 1.6.8 (Windows 8.1), Board: "Arduino/Genuino Uno"
C:\Users\cns\Desktop\arduino\hardware\tools\avr/bin/avr-ar: unable to rename 'core\core.a'; reason: Permission denied
exit status 1 Error compiling for board Arduino/Genuino Uno.
This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences.