That's strange. All that Infinite Carryweight does is add an item to your inventory that has a negative weight, not sure how it's killing. I'll take a look when I have some time

It works fine on my end. Are you on IWBUMS, and what mods are you using, if any?

You mean it can't work on IWBUMS?I think mine is IWBUMS,and there are indeed many other mods I'm using.Will them clash?In fact,I don't really know about IWBUMS,so I can't understand the difference.By the way,except this function,all of other aspects are good and that's enough for me now.Thanks for your explaination.If there is any problem,it'll be appreciate if you can tell me.Thanks again!