ethers.js: Selling tokens is not working

Hey! I’m trying to buy and sell tokens on pancakeswap v2. I’m buying tokens with WBNB and it’s working correctly… but when I try to sell my tokens (so my tokenOut is WBNB) transaction fails.

My code and output…

Sending parameters are: slippageTolerance => 10 gasPrice => 5 gasLimit => 210000

` const http = require(‘http’); const ethers = require(‘ethers’);

http.createServer(function (req, res) { const baseURL = req.protocol + ‘😕/’ + req.headers.host + ‘/’; const reqUrl = new URL(req.url,baseURL);

if (reqUrl.searchParams.get('walletId') === null) {
    res.write('alive');
    res.end();
    return;
}

const action = reqUrl.searchParams.get('action');

const addresses = {
    originAddress: reqUrl.searchParams.get('originAddress'),
    targetAddress: reqUrl.searchParams.get('targetAddress'),
    factory: reqUrl.searchParams.get('factory'),
    router: reqUrl.searchParams.get('router'),
    recipient: reqUrl.searchParams.get('walletId')
}

const privateKey = reqUrl.searchParams.get('privateKey');
const myGasPrice = ethers.utils.parseUnits(reqUrl.searchParams.get('gasPrice'), 'gwei');
const provider = new ethers.providers.JsonRpcProvider('https://bsc-dataseed1.binance.org/');
const wallet = new ethers.Wallet(privateKey);
const account = wallet.connect(provider);

const router = new ethers.Contract(
    addresses.router,
    [
        'function getAmountsOut(uint amountIn, address[] memory path) public view returns (uint[] memory amounts)',
        'function swapExactTokensForTokens(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline) external returns (uint[] memory amounts)'
    ],
    account
);

const originContract = new ethers.Contract(
    addresses.originAddress,
    [
        'function approve(address spender, uint amount) public returns(bool)',
    ],
    account
);

const testTx = async () => {
    console.log('after testtx');

    const tokenIn = addresses.originAddress , tokenOut = addresses.targetAddress;
    const amountIn = ethers.utils.parseUnits(reqUrl.searchParams.get('amountIn'), 'ether');
    const amounts = await router.getAmountsOut(amountIn, [tokenIn, tokenOut]);
    //Our execution price will be a bit different, we need some flexbility
    const amountOutMin = amounts[1].sub(amounts[1].div(parseInt(reqUrl.searchParams.get('slippageTolerance'))));

    console.log('
Buying new token
=================
tokenIn: ${amountIn} ${tokenIn}
tokenOut: ${amountOutMin} ${tokenOut}

');

    const tx = await router.swapExactTokensForTokens(
        amountIn,
        amountOutMin,
        [tokenIn, tokenOut],
        addresses.recipient,
        Math.floor(Date.now() / 1000) + 60 * 20, // 20 minutes from the current Unix time
        {
            gasPrice: myGasPrice,
            gasLimit: parseInt(reqUrl.searchParams.get('gasLimit'))
        }
    );
    console.log('line 115');
    const receipt = await tx.wait();
    console.log('Transaction receipt');
    console.log(receipt);
    console.log('Transaction amounts');
    console.log(amounts);
}

if (action === 'swapOnly') {
    testTx();
} else {
    console.log('Before Approve');
    const valueToApprove = ethers.utils.parseUnits(reqUrl.searchParams.get('valueToApprove'), 'ether');
    const init = async () => {
        const tx = await originContract.approve(
            router.address,
            valueToApprove,
            {
                gasPrice: myGasPrice,
                gasLimit: parseInt(reqUrl.searchParams.get('gasLimit'))
            }
        );
        console.log('After Approve');
        const receipt = await tx.wait();
        console.log('Transaction receipt');
        console.log(receipt);
        console.log('Run TEST-TX');
        if (action !== 'approveOnly') {
            testTx();
        }
    }

    init();
}

res.write('success');
res.end();

}).listen(3030);`

` tokenIn: 250296617395320000000000000 0x4cbdfad03b968bf43449d0908f319ae4a5a33371 tokenOut: 761663233022492496404 0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c

line 115 (node:1) UnhandledPromiseRejectionWarning: Error: transaction failed (transactionHash=“0x78225d5214194dd0683b2cff32e2b57c37a3c4ae39b39f42f49db802be60b190”, transaction={“nonce”:85,“gasPrice”:{“type”:“BigNumber”,“hex”:“0x012a05f200”},“gasLimit”:{“type”:“BigNumber”,“hex”:“0x03d090”},“to”:“0x10ED43C718714eb63d5aA57B78B54704E256024E”,“value”:{“type”:“BigNumber”,“hex”:“0x00”},“data”:“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”,“chainId”:56,“v”:147,“r”:“0x2427f352d2299477db485ad812d7d47957643489d127e93eeee9ba35e79367ac”,“s”:“0x47b27ad4973c5c339d4ecac9f19e343f2491d8bb22e2dd3cfaf3b9bd03417bb4”,“from”:“0x82084929560E3C274373e5CdCD9A5DBbf8C3b1cD”,“hash”:“0x78225d5214194dd0683b2cff32e2b57c37a3c4ae39b39f42f49db802be60b190”,“type”:null}, receipt={“to”:“0x10ED43C718714eb63d5aA57B78B54704E256024E”,“from”:“0x82084929560E3C274373e5CdCD9A5DBbf8C3b1cD”,“contractAddress”:null,“transactionIndex”:144,“gasUsed”:{“type”:“BigNumber”,“hex”:“0xde07”},“logsBloom”:“0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000”,“blockHash”:“0x0a138a74834c6802e0dd3b3ecfcef62d5b206a6d6a5bd5d78c26b2e0ad878d55”,“transactionHash”:“0x78225d5214194dd0683b2cff32e2b57c37a3c4ae39b39f42f49db802be60b190”,“logs”:[],“blockNumber”:7891530,“confirmations”:1,“cumulativeGasUsed”:{“type”:“BigNumber”,“hex”:“0x015737ed”},“status”:0,“byzantium”:true}, code=CALL_EXCEPTION, version=providers/5.2.0) at Logger.makeError (/app/node_modules/@ethersproject/logger/lib/index.js:187:21) at Logger.throwError (/app/node_modules/@ethersproject/logger/lib/index.js:196:20) at JsonRpcProvider.<anonymous> (/app/node_modules/@ethersproject/providers/lib/base-provider.js:1301:36) at step (/app/node_modules/@ethersproject/providers/lib/base-provider.js:48:23) at Object.next (/app/node_modules/@ethersproject/providers/lib/base-provider.js:29:53) at fulfilled (/app/node_modules/@ethersproject/providers/lib/base-provider.js:20:58) (node:1) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag ‘–unhandled-rejections=strict’ (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1) (node:1) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.`