[Ifeffit] Problem with using lincomb_fit function in the Larch

Hello Matt, I could not be able to perform LCA using the lincomb_fit function in the Larch software. I am getting the error message from line number 80 in the lincombo_fitting.py script. I expect the function has some bug with reading the group values. It could not be even able to read the default array 'norm' nither any user-provided 'arrayname' such as 'flat or fpp.' Can you suggest any solution for it? Please find the data files and larch script I am using for this purpose. Thanks, Akhil