@teastain Thank you for the reply. I have the AtomS3 Lite. I'll give that solution a try. I told M5 stack help people about the issue. My Ardunio IDE is 2.1.0. I'll update it.

Thank you for your reply. My tool config was set to USB CDC On Boot: "Disabled" so I changed it and then changed it back and restarted Arduino and go the same message. I did find this...https://github.com/m5stack/M5AtomS3/issues/23

I changed the .cpp file but it didn't work and I got a new error when I tried to compile the "button" example. I think I was supposed to compile the .cpp file, but I don't know how to do that. Anyway, my new error..

                 from /Users/dianehallinen/Documents/Arduino/libraries/M5AtomS3/src/M5AtomS3.h:8,
                 from /private/var/folders/tc/p1d_fw296cb18b8wnf6rdm280000gn/T/.arduinoIDE-unsaved20231026-41153-fswrn6.re979/Button/Button.ino:15:
/Users/dianehallinen/Documents/Arduino/libraries/FastLED/src/fastspi.h:157:23: note: #pragma message: No hardware SPI pins defined.  All SPI access will default to bitbanged output
 #      pragma message "No hardware SPI pins defined.  All SPI access will default to bitbanged output"
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/private/var/folders/tc/p1d_fw296cb18b8wnf6rdm280000gn/T/.arduinoIDE-unsaved20231026-41153-fswrn6.re979/Button/Button2.ino:20:6: error: redefinition of 'void setup()'
 void setup() {
      ^~~~~
/private/var/folders/tc/p1d_fw296cb18b8wnf6rdm280000gn/T/.arduinoIDE-unsaved20231026-41153-fswrn6.re979/Button/Button.ino:20:6: note: 'void setup()' previously defined here
 void setup() {
      ^~~~~
/private/var/folders/tc/p1d_fw296cb18b8wnf6rdm280000gn/T/.arduinoIDE-unsaved20231026-41153-fswrn6.re979/Button/Button2.ino:29:6: error: redefinition of 'void loop()'
 void loop() {
      ^~~~
/private/var/folders/tc/p1d_fw296cb18b8wnf6rdm280000gn/T/.arduinoIDE-unsaved20231026-41153-fswrn6.re979/Button/Button.ino:29:6: note: 'void loop()' previously defined here
 void loop() {
      ^~~~

exit status 1

Compilation error: redefinition of 'void setup()'

I'm having the same problem. I've tried a number of the examples and get various error messages. I recently updated my libraries, I have a feeling the problem is in there.