Led matrix

[kikideveloperservice]

Any ideas why this error code is coming up? Apologies if it is completely obvious, I've just started with Arduino.

Arduino: 1.6.13 (Windows 10), Board: "Arduino/Genuino Uno"

c:\program files (x86)\arduino\hardware\tools\avr\bin../lib/gcc/avr/4.9.2/../../../../avr/bin/ar.exe: 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.