# Limitations

When making requests to Backpack in Establishing a Connection, Sending a Transaction, or Signing a Message, Backpack may respond with an error.

## Errors

The following is a list of all possible error codes and their meanings. These error messages are inspired by Ethereum's [EIP-1474](https://eips.ethereum.org/EIPS/eip-1474#error-codes) and [EIP-1193](https://eips.ethereum.org/EIPS/eip-1193#provider-errors).

| Code   | Title                            | Description                                                                                                                                                                                                                                                                                        |
| ------ | -------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 4900   | Disconnected                     | Backpack could not connect to the network.                                                                                                                                                                                                                                                         |
| 4100   | Unauthorized                     | The requested method and/or account have not been authorized by the user.                                                                                                                                                                                                                          |
| 4001   | User Rejected Request            | The user rejected the request through Backpack.                                                                                                                                                                                                                                                    |
| -32000 | Invalid Input                    | Missing or invalid parameters.                                                                                                                                                                                                                                                                     |
| -32002 | Requested resource not available | <p>This error occurs when an app attempts to submit a new transaction while Backpack's approval dialog is already open for a previous transaction.</p><p>Only one approve window can be open at a time. Users should approve or reject their transactions before initiating a new transaction.</p> |
| -32003 | Transaction Rejected             | Backpack does not recognize a valid transaction.                                                                                                                                                                                                                                                   |
| -32601 | Method Not Found                 | Backpack does not recognize the method.                                                                                                                                                                                                                                                            |
| -32603 | Internal Error                   | Something went wrong within Backpack.                                                                                                                                                                                                                                                              |

Typically, these errors will be easily parseable and have both a code and an explanation. For example:

```
try {
  await window.solana.signMessage();
} catch (err) {
  //  {code: 4100, message: 'The requested method and/or account has not been authorized by the user.'}
}
```


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