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[bsnrjones]

I am a complete noob and can't get the sketch to compile, here is the errors any ideas??:

sketch\Wimp_Weather_Station.ino.cpp.o: In function `calcWeather()':

C:\Users\N0HYD\Documents\Arduino\Wimp_Weather_Station-master\Wimp_Weather_Station/Wimp_Weather_Station.ino:414: undefined reference to `HTU21D::readHumidity()'

C:\Users\N0HYD\Documents\Arduino\Wimp_Weather_Station-master\Wimp_Weather_Station/Wimp_Weather_Station.ino:420: undefined reference to `MPL3115A2::readTempF()'

C:\Users\N0HYD\Documents\Arduino\Wimp_Weather_Station-master\Wimp_Weather_Station/Wimp_Weather_Station.ino:431: undefined reference to `MPL3115A2::readPressure()'

sketch\Wimp_Weather_Station.ino.cpp.o: In function `setup':

C:\Users\N0HYD\Documents\Arduino\Wimp_Weather_Station-master\Wimp_Weather_Station/Wimp_Weather_Station.ino:173: undefined reference to `MPL3115A2::begin()'

C:\Users\N0HYD\Documents\Arduino\Wimp_Weather_Station-master\Wimp_Weather_Station/Wimp_Weather_Station.ino:174: undefined reference to `MPL3115A2::setModeBarometer()'

C:\Users\N0HYD\Documents\Arduino\Wimp_Weather_Station-master\Wimp_Weather_Station/Wimp_Weather_Station.ino:175: undefined reference to `MPL3115A2::setOversampleRate(unsigned char)'

C:\Users\N0HYD\Documents\Arduino\Wimp_Weather_Station-master\Wimp_Weather_Station/Wimp_Weather_Station.ino:176: undefined reference to `MPL3115A2::enableEventFlags()'

C:\Users\N0HYD\Documents\Arduino\Wimp_Weather_Station-master\Wimp_Weather_Station/Wimp_Weather_Station.ino:177: undefined reference to `MPL3115A2::setModeActive()'

C:\Users\N0HYD\Documents\Arduino\Wimp_Weather_Station-master\Wimp_Weather_Station/Wimp_Weather_Station.ino:180: undefined reference to `HTU21D::begin()'

sketch\Wimp_Weather_Station.ino.cpp.o: In function `__static_initialization_and_destruction_0':

C:\Users\N0HYD\Documents\Arduino\Wimp_Weather_Station-master\Wimp_Weather_Station/Wimp_Weather_Station.ino:36: undefined reference to `MPL3115A2::MPL3115A2()'

C:\Users\N0HYD\Documents\Arduino\Wimp_Weather_Station-master\Wimp_Weather_Station/Wimp_Weather_Station.ino:37: undefined reference to `HTU21D::HTU21D()'

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling for board Arduino/Genuino Uno.