Trying to program a 2560 mini with a 2560 nano, not working

Here is the error message:

Arduino: 1.8.13 (Mac OS X), Board: "Arduino Mini, ATmega328P"

Sketch uses 5546 bytes (19%) of program storage space. Maximum is 28672 bytes. Global variables use 52 bytes (2%) of dynamic memory, leaving 1996 bytes for local variables. Maximum is 2048 bytes. avrdude: ser_open(): can't open device "/dev/cu.usbserial-1410": No such file or directory

Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

Im doing this because my 2560 Mini isnt showing up in device manager on my PC and doesnt show up on my Mac either. Ive updated drivers and it uses a ATmega16U2. So instead of worrying fixing that confusing issue I decided to program it using my other arduino. Now Im out of ideas. Help!

This report would have more information with "Show verbose output during compilation" option enabled in File -> Preferences.