When I try to upload the OpenCat code to bittle the message "Error compiling for board Arduino Uno." How do I solve this?

Hi, I'm having some problem with dpwnloading the OpenCat code onto Bittle, and this comes up; OpenCat:603:17: error: 'pwm' was not declared in this scope pwm.setPWM(pin(target[0]), 0, duty); ^~~ OpenCat:610:19: error: 'pwn' was not declared in this scope pwn = 0; ^~~ C:\Users\--\Downloads\OpenCat-jump\OpenCat-jump\OpenCat\OpenCat.ino:610:19: note: suggested alternative: 'pin' pwn = 0; ^~~ pin OpenCat:611:19: error: 'pwm' was not declared in this scope pwm.setPWM(pin(target[0]), 0, duty); ^~~ How do I solve this?