When using AnchorEarn from the @anchor-protocol/anchor-earn module to get a balance

import { AnchorEarn } from '@anchor-protocol/anchor-earn'


const userBalance = await anchorEarn.balance({
            currencies: [DENOMS.UST],
        });

I am getting the following error:

userCoins.get is not a function

I am using the following script to install it npm i @anchor-protocol/anchor-earn and I am following the sample script in Anchor's website, any idea of what could be happening here?