Hi,
It's hard to conclude with just the information you provided.
The error message might come from other shipping methods you've configured on your shop.
If you have only configured the shipping method for which you provided your screenshot, then it means that the problem is with the weight of your product "compost tea discharge pump" which is lower than 1LB.
If you have other shipping methods enabled, then it's hard to say were the problem is, because HikaShop only displays 1 error message when several shipping methods provide error messages. In that case, I would recommend you to disable the other shipping methods temporarily so that you can get the error message of the UPS shipping method.