> ## Documentation Index
> Fetch the complete documentation index at: https://docs.relay.link/llms.txt
> Use this file to discover all available pages before exploring further.

# Troubleshooting

> Troubleshooting tips and tricks for debugging issues with Relay.

## Failed Fill Transactions

If the fill transaction fails you may get some useful data returned from the [requests api](/references/api/get-requests):

* [failedTxHash](/references/api/get-requests#response-requests-items-data-failed-tx-hash)
* [failedTxBlockNumber](/references/api/get-requests#response-requests-items-data-failed-tx-block-number)
* [failedCalldata](/references/api/get-requests#response-requests-items-data-failed-call-data)

You can use these values to simulate the transaction in [Tenderly](https://tenderly.co) or similar tools to see the exact error message and revert reason.

### Step 1: Get the failed data

<Tip>You can also access this data by going to the [Relay transaction page](https://www.relay.link/transaction/0x27714ec23ddd6466f383c77368692f948d7c52d320de03b371d0f310437bcb2a) and using the Ctrl + i shortcut to open up the full request data.</Tip>

<CodeGroup>
  ```bash cURL theme={null}
  curl -X GET "https://api.relay.link/requests/v2?id=0x27714ec23ddd6466f383c77368692f948d7c52d320de03b371d0f310437bcb2a"
  ```

  ```json Response theme={null}
  {
    "failedTxBlockNumber": 43159746,
    "failedCallData": {
      "from": "0xf70da97812CB96acDF810712Aa562db8dfA3dbEF",
      "to": "0xBBbfD134E9b44BfB5123898BA36b01dE7ab93d98",
      "data": 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      "value": "0"
    }
  }
  ```
</CodeGroup>

### Step 2: Simulate the transaction in Tenderly

Open up your Tenderly dashboard, click simulator and then new simulation. Then paste in the required datapoints from the values above.

<img src="https://mintcdn.com/unevenlabs/SZDUsu0sszNtZIyP/images/tenderly-simulation.png?fit=max&auto=format&n=SZDUsu0sszNtZIyP&q=85&s=703d95a204a390439286856a9f2e5160" alt="Tenderly Simulation" width="3428" height="1782" data-path="images/tenderly-simulation.png" />

You should then see the simulation rendered in Tenderly with an in depth error message and where the revert happened.