me too
I had this problem too, just accidentally fixed it. The error is correct, the cat list of your clan is out of range. Go into your clan cat excel list and scroll all the way to the right of the info, then slowly scroll down. There should be atleast one cat whose information is in the wrong box, just one box over from where it should be. It will say "none" or have a set of numbers where, for every other cat, its blank. That will tell you which cats are "out of range".
Then, simply scroll on that cats info list all the way back to their name, and move all their information to the left by one box.
For me, my cat's name was broken, and the first part of their name was under the gender column, then gender under the warrior column, etc. So i had to take the first part of the name and put it behind the second part, and then the rest was just simple moving of info over one box