Checking KINT balance

[mariusz-PL]

Hi guys,
I want to check KINT balance. Can you tell me where i do mistakes?

import pkg from '@interlay/interbtc';
const { createInterbtc } = pkg;
const PARACHAIN_ENDPOINT = 'wss://api-kusama.interlay.io/parachain';
const isMainnet = true;
const account = 'aXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX';

async function main () {
const api = await createInterbtc(PARACHAIN_ENDPOINT, isMainnet)
const interBtc = await api.polkadotApi;
let data = await interBtc.query.tokens.accounts(account, 'kint')
console.log(data)
//..
}
main().catch(console.error).finally(() => process.exit());

shows up..
RPC-CORE: getMetadata(at?: BlockHash): Metadata:: createType(Metadata):: decodeU8a: failed at 0x0e5506000c1c7370… on metadata:: decodeU8a: failed at 0xa81853797374656d… on pallets: Vec:: decodeU8a: failed at 0x1853797374656d01… on : {"name":"Text","storage":"Option","calls":"Option","events":"Option","constants":"Vec","errors":"Option","index":"u8"}:: decodeU8a: failed at 0x011853797374656d… on storage: Option:: decodeU8a: failed at 0x401c4163636f756e… on items: Vec:: decodeU8a: failed at 0x04e8205468652066… on : {"name":"Text","modifier":"StorageEntryModifierV14","type":"StorageEntryTypeV14","fallback":"Bytes","docs":"Vec"}:: decodeU8a: failed at 0x68652066756c6c20… on modifier: {"_enum":{"Optional":0,"Default":1,"Required":2}}:: Unable to create Enum via index 104, in Optional, Default, Required

what I doing wrong?
when i trying connect with the same code to Interbtc with >const PARACHAIN_ENDPOINT = 'wss://api.interlay.io/parachain';< it's ok