Error Compiling for board Arduino Uno using Example Codes

[in0]

@eileend

Arduino: 1.8.16 (Mac OS X), Board: "Arduino Uno"

/private/var/folders/pf/zwvwb5n93qj972ltxgc558j40000gp/T/AppTranslocation/06694151-1FB8-46A7-A41D-9B56D3477747/d/Arduino.app/Contents/Java/libraries/Adafruit_Circuit_Playground/Adafruit_CircuitPlayground.cpp: In member function 'void Adafruit_CircuitPlayground::playTone(uint16_t, uint16_t, bool)':
/private/var/folders/pf/zwvwb5n93qj972ltxgc558j40000gp/T/AppTranslocation/06694151-1FB8-46A7-A41D-9B56D3477747/d/Arduino.app/Contents/Java/libraries/Adafruit_Circuit_Playground/Adafruit_CircuitPlayground.cpp:238:3: error: 'PLLFRQ' was not declared in this scope
PLLFRQ = (PLLFRQ & 0xCF) | 0x30; // Route PLL to async clk
^~~~~~

The "Adafruit_Circuit_Playground" library is not compatible with the Arduino Uno board.

If you actually have an Adafruit Circuit Playground board, then you need to select that board from the Arduino IDE's Tools > Board menu.

If you actually have an Uno, then you can't use that library.