Levin's Code - calc_welframsey

Dear experts,
I’m using Levin’s code to calculate the welfare, the readme file says: “Finally, note that the program calc_welframsey.m can be used to compute conditional expected welfare at the deterministic steady state.” But when I tried to run it file, I got the next message:
?? Undefined function or variable ‘idwelf’.

Error in ==> calc_welframsey at 15
ramadj = ramadj - dr_.ghx(idwelf,idk)*ys_(ik) …

I really don’t know what is idwelf.

Thanks in advance for your help.
calc_welframsey.m (747 Bytes)