问无效的JSON RPC响应："“

EN

const HDWalletProvider = require("truffle-hdwallet-provider-privkey");
const privKey = "my-address's private key from which i want to deploy it"; 

module.exports = {
 networks: {
     development: {
        host: "localhost",
        port: 8545,
        network_id: "*" // Match any network id
     },
     rinkeby: {
         provider: function() {
              return new HDWalletProvider(privKey, "https://rinkeby.infura.io/mytokenid");
         },
         network_id: 4,
         gas: 7003605,
         gasPrice: 21,

    }
  }
};