error in com

i see this error in uploading my program to arduino,however i used the same one with the windows befor

         Using Port                    : COM20
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: ser_open(): can't open device "\\.\COM20": The system cannot find the file specified.

avrdude done.  Thank you.

Problem uploading to board.  See for suggestions.

maybe whatever you did prior to this blew out your Arduino

can't say for sure

Select the port of your Arduino from the Tools > Port menu. If that menu is grayed out or the port of your Arduino board is not shown then one of the following may be the cause:

  • You may need to install the driver for the USB-serial chip on your Arduino. Determine which chip is used on your Arduino and install the driver.
  • You may be using a charge-only or defective USB cable. Test your cable on another device to confirm that it works for data.
  • Using a USB 3.0 port on your computer may cause problems. Try a USB 2.0 port or use a USB 2.0 hub plugged into your USB 3.0 port.