User configuration file does not exist or is not a regular file, skipping

Hey there! I'm new to this arduino Board. I'm using Arduino in a MacBook Pro with iOS Mojave 10.14.4 and had been having this error

fork/exec /Users/manue/Library/Arduino15/packages/arduino/tools/avr-gcc/5.4.0-atmel3.6.1-arduino2/bin/avr-g++: no such file or directory
Error compilando para la tarjeta Arduino Nano.

so i tried following these instructions:

Click the link on the line following File > Preferences > More preferences can be edited directly in the file. This will open the /Users/brunoloverius/Library/Arduino15 folder.
Delete all files and folders under the Arduino15 folder except for preferences.txt. Please be very careful when deleting things from your computer. When in doubt, back up!
Restart the Arduino IDE

and now got this error:

avrdude: Version 6.3-20171130
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch

System wide configuration file is "/Applications/Arduino.app/Contents/Java/hardware/tools/avr/etc/avrdude.conf"
User configuration file is "/Users/manue/.avrduderc"
User configuration file does not exist or is not a regular file, skipping

Using Port : /dev/cu.wchusbserial14120
Using Programmer : arduino
Overriding Baud Rate : 115200
avrdude: ser_open(): can't open device "/dev/cu.wchusbserial14120": No such file or directory

avrdude done. Thank you.

Problema subiendo a la placa. Visita Arduino Help Center para sugerencias.

so... Um... don't really know what to do. I've been trying several things and stuff but still cant get it. Has anyone got some idea of what to do?

meowrhino:
User configuration file is "/Users/manue/.avrduderc"
User configuration file does not exist or is not a regular file, skipping

This is message is normal and expected. You can safely ignore it. The Arduino IDE comes with its own avrdude configuration file.

meowrhino:
avrdude: ser_open(): can't open device "/dev/cu.wchusbserial14120": No such file or directory

This is the error you need to be concerned about. You need to select the port of your Nano from the Arduino IDE's Tools > Port menu. Is /dev/cu.wchusbserial14120 listed on that menu?