I have a problem with my arduino. When i try to upload a code to a Arduino nano i get this compiling error: C:\Program Files (x86)\Arduino\hardware\tools\avr\bin\avr-ar: unable to rename 'core.a'; reason: Permission denied. I had problems with that arduino, first i got this compiling problem avrdude: ser_open(): can't set com state for "com6 problem. When i try to upload a sketch to my Arduino Uno it doen't come with this problem. Has anyone experience with this compiling problem?