Internal Server Error

`const flashbotsProvider = await FlashbotsBundleProvider.create(
provider,
authSigner,
// 使用主网 Flashbots，需要把下面两行删去
'https://relay-sepolia.flashbots.net/',
'sepolia'
);

// EIP 1559 transaction
const transaction0 = {
chainId: 11155111,
type: 2,
to: "0xC1c4301C5bd4eBe2C04817aC815AaceB4DeDA8DB",
value: ethers.utils.parseEther("0.001"),
maxFeePerGas: GWEI * 100n
}

// 5. 创建交易 Bundle
const transactionBundle = [
{
signer: wallet, // ethers signer
transaction: transaction0 // ethers populated transaction object
}
// 也可以加入mempool中签名好的交易（可以是任何人发送的）
// ,{
// signedTransaction: SIGNED_ORACLE_UPDATE_FROM_PENDING_POOL // serialized signed transaction hex
// }
]

// 6. 模拟交易，交易模拟成功后才能执行
// 签名交易
const signedTransactions = await flashbotsProvider.signBundle(transactionBundle)
// 设置交易的目标执行区块（在哪个区块执行）
const targetBlockNumber = (await provider.getBlockNumber()) + 1
// 模拟
const simulation = await flashbotsProvider.simulate(signedTransactions, targetBlockNumber)`

the resualt log :

body: '{"error":"Internal Server Error"}',