client.getBalance() is error . why

[LeonYanghaha]

I tried to get the balance with this code, but there were these errors, right? Who can tell me what to do? Thank you very much

CODE：

` let BTCHelper = {}; let client;

BTCHelper.initlize = function(){

client = new Client({
    host:config.provider_ip,
    port: config.provider_port,
    username: config.username,
    password: config.password,
    timeout: 30000
});

};

(async ()=>{

BTCHelper.initlize();

const mainWalletBalance = await client.getBalance({ account: '*', minconf: 0 });

console.log(mainWalletBalance);

})() `

ERROR:

[LeonYanghaha]

This code, it's ok

const mainWalletBalance = await client.getBalance();