bep20 failed to obtain balance

[leo98123]

my code:
$apiKey = 'my apikey************';
$api = new \Binance\BscscanApi($apiKey);
$config = [
'contract_address' => '0x55d398326f99059fF775485246999027B3197955',// USDT BEP20
'decimals' => 18,
];
$address = '0xA3E043CA89B6dA1ae800a4816ff22afea1e2cAcf';
$bep20 = new \Binance\BEP20($api, $config);
$usdtBalance = $bep20->balance($address);
echo $usdtBalance;

My code is as above. No matter which address is filled in, the return is 0.000000014. I entered the code debugging and found that BEP20.PHP
method:
public function balance(string $address)
{
$params = [];
$params['to'] = $this->contractAddress;
$method = 'balanceOf(address)';
$formatMethod = Formatter::toMethodFormat($method);
$formatAddress = Formatter::toAddressFormat($address);

$params['data'] = "0x{$formatMethod}{$formatAddress}";
$balance = $this->proxyApi->ethCall($params);
echo "ethCall Response: " . json_encode($balance) . "
";
return Utils::toDisplayAmount($balance, $this->decimals);
}
The debugging result is:
ethCall Response: "Error!"

I don't know what went wrong now.