# Limitations（限制）

在向 Backpack 发起连接、发送交易或签名消息请求时，Backpack 可能会响应error。

## Errors（错误处理）

以下是所有可能的错误代码及其含义。这些错误信息借鉴了 Ethereum 的 [EIP-1474 ](https://eips.ethereum.org/EIPS/eip-1474#error-codes)和 [EIP-1193](https://eips.ethereum.org/EIPS/eip-1193#provider-errors) 标准。

| 错误代码   | 标题                               | 描述                                                                         |
| ------ | -------------------------------- | -------------------------------------------------------------------------- |
| 4900   | Disconnected                     | Backpack 无法连接到网络。                                                          |
| 4100   | Unauthorized                     | 请求的方法和/或账户未获得用户授权。                                                         |
| 4001   | User Rejected Request            | 用户通过 Backpack 拒绝了请求。                                                       |
| -32000 | Invalid Input                    | 缺少或无效的参数。                                                                  |
| -32002 | Requested resource not available | 当应用尝试提交新交易时，若 Backpack 的审批对话框已打开，出现此错误。每次只能有一个审批窗口打开。用户应在发起新交易之前批准或拒绝当前交易。 |
| -32003 | Transaction Rejected             | Backpack 无法识别有效的交易。                                                        |
| -32601 | Method Not Found                 | Backpack 无法识别此方法。                                                          |
| -32603 | Internal Error                   | Backpack 内部错误。                                                             |

通常，这些错误信息具有易于解析的结构，包含错误代码和解释。例如：

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

这些错误将帮助开发者识别问题并采取相应的措施。错误信息中的 `code` 表示具体的错误类型，`message` 则提供关于错误的详细说明。


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