> For the complete documentation index, see [llms.txt](https://docs.flash.trade/flash-trade/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.flash.trade/flash-trade/flash-trade-protocol/build-on-flash/flash-trade-v2/errors.md).

# Errors

HTTP errors, on-chain codes, and how to recover.

Failures land in one of two places — the HTTP layer, or the on-chain program when you submit a built transaction.

| Page                                                                                                                  | Covers                                                                |
| --------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------- |
| [HTTP errors](/flash-trade/flash-trade-protocol/build-on-flash/flash-trade-v2/errors/http-errors.md)                  | Status codes and the two error shapes (`error` vs `err`)              |
| [On-chain error codes](/flash-trade/flash-trade-protocol/build-on-flash/flash-trade-v2/errors/onchain-error-codes.md) | Program error codes (6000–6111) and what they mean                    |
| [Recovery patterns](/flash-trade/flash-trade-protocol/build-on-flash/flash-trade-v2/errors/recovery-patterns.md)      | Concrete fixes: wrong RPC, not delegated, stuck withdrawal, blockhash |

**Quick rule:** the API uses `"error"` for HTTP-level failures and `"err"` for compute failures returned inside a `200` body (quote endpoints). Always check both.


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