Issue - can you assist?

[amamethven]

Hi there,
I have set this project up - note I am using the USB evaluation connector supplied by sensirion/nicolay - and get the following error. Are you able to assist:
Arduino: 1.8.19 (Windows Store 1.8.57.0) (Windows 10), Board: "Arduino Uno"
C:\Users\amamethven-laptop\AppData\Local\Temp\cceHEvzc.ltrans0.ltrans.o: In function global constructors keyed to 65535_0_take3.ino.cpp.o.3373': <artificial>:(.text.startup+0x10c): undefined reference to SFM3300::SFM3300(int)'
C:\Users\amamethven-laptop\AppData\Local\Temp\cceHEvzc.ltrans0.ltrans.o: In function setup': C:\Users\amamethven-laptop\Documents\Arduino\take3/take3.ino:59: undefined reference to SFM3300::hardReset(unsigned char)'
C:\Users\amamethven-laptop\Documents\Arduino\take3/take3.ino:61: undefined reference to SFM3300::init()' C:\Users\amamethven-laptop\AppData\Local\Temp\cceHEvzc.ltrans0.ltrans.o: In function loop':
C:\Users\amamethven-laptop\Documents\Arduino\take3/take3.ino:87: undefined reference to SFM3300::getvalue()' C:\Users\amamethven-laptop\Documents\Arduino\take3/take3.ino:101: undefined reference to SFM3300::hardReset(unsigned char)'
C:\Users\amamethven-laptop\Documents\Arduino\take3/take3.ino:102: undefined reference to `SFM3300::init()'
collect2.exe: error: ld returned 1 exit status
exit status 1
Error compiling for board Arduino Uno.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.