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我在使用 uniswapV2 路由器交换 Solidity 时遇到了一些问题。那是我的测试脚本

it("swap", async function () {
  let rec = [receivers1, receivers2, receivers3];
  const somma = await mecenate.calculate(rec, level);
  const toBuy = new BigNumber.from(somma);
  const amountInMin = await mecenate.getAmountsIn(toBuy);
  const ownerBalanceBefore = await provider.getBalance(owner.address);
  
  console.log(toBuy, amountInMin[0], owner.address);
  
  await mecenate.swapUSTtoETH(toBuy, amountInMin[0], owner.address);
  const ownerBalanceAfter = await provider.getBalance(owner.address);
  expect(ownerBalanceAfter).to.equal(ownerBalanceBefore);
});

这是我的合约功能

    function swapUSTtoETH(uint256 _amountOut, uint256 _amountInMax, address _to) external 
    isOwner 
     {
    uint toApprove = _amountInMax *5;
    IERC20(USTaddress).transferFrom(msg.sender, address(this), _amountInMax);

    IERC20(USTaddress).approve(routerV2, toApprove);
    
    uni.swapTokensForExactETH(
    _amountOut,
    _amountInMax,
    getPathForUSTtoETH(),
    _to,
    block.timestamp
    );
}

给我这个错误：

   ProviderError: VM Exception while processing transaction: revert Failed to send Ether

谢谢

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