未捕获（按承诺）TypeError：无法获取

Question

我正按照教程尝试构建加密货币计算器。

但是，控制台中出现两个以下错误：

1）GET https://api.coinmarketcap.com/v1/ticker/净:: ERR_BLOCKED_BY_CLIENT

2）index.html：1未捕获（承诺）TypeError：无法获取

class UI{
    constructor(){
        this.init();
    }

    init(){
        this.printCryptoCurrencies();
    }

    // Prints the options for the form
    printCryptoCurrencies(){
        cryptoAPI.getCryptoCurrenciesList()
            .then(data => {
                const cryptoCurrencies = data.cryptoCurrencies;
            })
    }
}

class CryptoAPI{

    // Get all the cryptocurrencies
    async getCryptoCurrenciesList(){
        const url = await fetch('https://api.coinmarketcap.com/v1/ticker/');

        //Return as JSON
        const cryptoCurrencies = await url.json();

        // Return the object
        return{
            cryptoCurrencies
        }
    }
}

// Instantiate the classes

const cryptoAPI = new CryptoAPI();
const ui = new UI();

能请你帮忙吗？