My Arduino UNO board no longer has its LED light switched on because of this error message
Arduino: 1.8.1 (Windows 10), Board: "Arduino/Genuino Uno" Sketch uses 1984 bytes (6%) of program storage space. Maximum is 32256 bytes. Global variables use 188 bytes (9%) of dynamic memory, leaving 1860 bytes for local variables. Maximum is 2048 bytes. avrdude: ser_open(): can't open device "\\.\COM1": 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" option enabled in File -> Preferences.
What is the cause of this error and what needs to be done to solve it?