Problem with PoS Bridge

I’m trying to test my implementation, I’m just try to get the balance of PoS erc20, but I receive an error about gas.

  parent: {
    rpc: process.env.GOERLI_RPC_URL,
  },
  child: {
    rpc: 'https://matic-mumbai.chainstacklabs.com',
  },
const getMaticPOSClient = () => {
  return new MaticPOSClient({
    network: 'testnet',
    version: 'mumbai',
    parentProvider: new HDWalletProvider(PRIVATE_KEY, config.parent.rpc),
    maticProvider: new HDWalletProvider(PRIVATE_KEY, config.child.rpc),
    parentDefaultOptions: { from: USER_ADDRESS },
    maticDefaultOptions: { from: USER_ADDRESS },
  });
};
const SCALING_FACTOR = new bn(10).pow(new bn(18));

const execute = async () => {
  const maticPOSInstance = getMaticPOSClient();
  const balance = await maticPOSInstance.balanceOfERC20(
    from,
    pos.child.erc20,
    {}
  );
  const balanceInToken = new bn(balance).div(SCALING_FACTOR);

  console.log(`Balance of ${from} on PoS bridge is ${balanceInToken} TST`);
};

execute().then(() => process.exit(0));

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