Satisfies all conditions set by Solidity `require` statements. does not trigger a Solidity `revert` statement. SafeERC20: low-level call failed


We have created the crowd sale smart contract .This is my Token smart contract

//SPDX-License-indetifier :Unlicense

pragma solidity ^0.5.0;

import "../node_modules/@openzeppelin/contracts/token/ERC20/ERC20.sol";

import "../node_modules/@openzeppelin/contracts/token/ERC20/ERC20Detailed.sol";

import "../node_modules/@openzeppelin/contracts/GSN/Context.sol";

contract Token is Context , ERC20, ERC20Detailed {

 constructor (string memory _name ,string memory _symbol ,uint8 _decimals,uint256 _initialsupply) public ERC20Detailed(_name ,_symbol, _decimals){

     _mint(_msgSender(), _initialsupply * (10 ** uint256(_decimals)));



and this is my crowd sale contract

contract CrodsaleContract is Crowdsale{

   uint _rate,
   address payable _wallet,
   IERC20 token,
   Crowdsale(_rate ,_wallet ,token)



and this is my migration code

module.exports = async function (deployer ,network, accounts){


await deployer.deploy(TOKEN,"US1 Token" ,"US1",18,1000000000);

const token = await TOKEN.deployed();

await deployer.deploy(CrodsaleContract, 1, accounts[0], token.address)

 const crowdsale = await Us1Crowdsale.deployed();

 token.transfer(crowdsale.address ,await token.totalSupply())

        //   console.log(crowdsale);

await crowdsale.sendTransaction({value: web3.utils.toWei('10', 'gwei'), gas: '220000'})

// const trans= await crowdsale.buyTokens(accounts[0], { value: web3.utils.toWei(1000000, 'ether'), from: accounts[0] })

after the deploy successfully we are not able to buyTokens. we are getting error.

Transaction: 0x57b96ee4ad13929502f7e0215103f1ed17f169c6fda1ba835e7da81b8d233b68 exited with an error (status 0). Reason given: SafeERC20: low-level call failed.
Please check that the transaction:
- satisfies all conditions set by Solidity require statements.
- does not trigger a Solidity revert statement.

Please check that the code. and please let me know if any correction is there. why getting this error