Hi all
i have been working on a project and suddenly while trying to upload some code to my arduino uno i started getting this error.
Arduino: 1.8.1 (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: File exists
exit status 1
Error compiling for board Arduino/Genuino Uno.
Sketch uses 4802 bytes (14%) of program storage space. Maximum is 32256 bytes.
Global variables use 337 bytes (16%) of dynamic memory, leaving 1711 bytes for local variables. Maximum is 2048 bytes.
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xff
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x81
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x24
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x40
An error occurred while uploading the sketch
can anyone explain what is going on here and how i might fix it
regards samuel