Please help with this error. Arduino: 1.8.10 (Windows 10), Board: "Arduino Uno"
Sketch uses 882 bytes (2%) of program storage space. Maximum is 32256 bytes. Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes. avrdude: ser_open(): can't open device "\.\COM4": Access is denied.
Windows 10 Pro Arduino UNO ATmeg 328P-PU Have never been able to Upload a sketch. Pin 13 and Orange LED blink at 1 second