This is my first attempt of compiling something in the Arduino environment, so a lot of obvious things aren't that obvious to me. So after hopefully installing all the right libraries, I get a lot of errors of the kind shown below: C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.55.0_x86__mdqgnx93n4wtt\libraries\Adafruit_Circuit_Playground\Adafruit_CircuitPlayground.cpp: In member function 'void Adafruit_CircuitPlayground::playTone(uint16_t, uint16_t, bool)': C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.55.0_x86__mdqgnx93n4wtt\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 ^~~~~~ C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.55.0_x86__mdqgnx93n4wtt\libraries\Adafruit_Circuit_Playground\Adafruit_CircuitPlayground.cpp:238:3: note: suggested alternative: 'PCIFR' PLLFRQ = (PLLFRQ & 0xCF) | 0x30; // Route PLL to async clk ^~~~~~ PCIFR C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.55.0_x86__mdqgnx93n4wtt\libraries\Adafruit_Circuit_Playground\Adafruit_CircuitPlayground.cpp:239:3: error: 'TCCR4A' was not declared in this scope TCCR4A = _BV(COM4A0) | _BV(PWM4A); // Clear on match, PWMA on ^~~~~~ C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.55.0_x86__mdqgnx93n4wtt\libraries\Adafruit_Circuit_Playground\Adafruit_CircuitPlayground.cpp:239:3: note: suggested alternative: 'TCCR0A' TCCR4A = _BV(COM4A0) | _BV(PWM4A); // Clear on match, PWMA on ^~~~~~ TCCR0A In file included from c:\program files\windowsapps\arduinollc.arduinoide_1.8.55.0_x86__mdqgnx93n4wtt\hardware\tools\avr\avr\include\avr\io.h:99:0, from c:\program files\windowsapps\arduinollc.arduinoide_1.8.55.0_x86__mdqgnx93n4wtt\hardware\tools\avr\avr\include\avr\pgmspace.h:90, from C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.55.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\cores\arduino/Arduino.h:28, from C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.55.0_x86__mdqgnx93n4wtt\libraries\Adafruit_Circuit_Playground/utility/Adafruit_CPlay_LIS3DH.h:30, from C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.55.0_x86__mdqgnx93n4wtt\libraries\Adafruit_Circuit_Playground/Adafruit_Circuit_Playground.h:21, from C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.55.0_x86__mdqgnx93n4wtt\libraries\Adafruit_Circuit_Playground\Adafruit_CircuitPlayground.cpp:30: ... ... exit status 1 Error compiling for board Arduino Uno. Any ideas would be highly appreciated. Cheers, -max