I'm not able to upload the code onto my Uno. My computer runs on windows 8.1. I was able to do it earlier and had tried out many projects which worked. But, now, it isn't uploading and these are the error message it showed:
Arduino: 1.6.3 (Windows 8.1), Board: "Arduino Uno"
avrdude: ser_open(): can't open device "\.\COM3": The system cannot find the file specified.
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.
I have tried out everything given on http://www.arduino.cc/en/Guide/Troubleshooting#upload.
Thanks in advance
Aman