I am getting these errors:
cozir_scetch.cpp.o: In function loop': C:\Users\Erik\Documents\Arduino/cozir_scetch.ino:18: undefined reference to COZIR::Celsius()'
C:\Users\Erik\Documents\Arduino/cozir_scetch.ino:19: undefined reference to COZIR::Fahrenheit()' C:\Users\Erik\Documents\Arduino/cozir_scetch.ino:20: undefined reference to COZIR::Humidity()'
C:\Users\Erik\Documents\Arduino/cozir_scetch.ino:21: undefined reference to COZIR::CO2()' cozir_scetch.cpp.o: In function __static_initialization_and_destruction_0':
C:\Users\Erik\Documents\Arduino/cozir_scetch.ino:6: undefined reference to `COZIR::COZIR(SoftwareSerial&)'
collect2.exe: error: ld returned 1 exit status