hello,
which script did you use? I think Jimmy applied some corrections to my original script: FNIRS data import - #9 by Jimmyuba1 .
You will need then to indicate the path to the data and execute the script.
I think i will need some details on the error you are facing to provide more help.
Also, If by any chance you manage to contact the author and have the data shared in the more standard format (BIDS?) and with the optodes coordinates, that would be great 
Edouard