# SDK error codes

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> **Beginning March 2 2026**, apps joining meetings outside their account must be authorized. Authorize apps by using either ZAK or OBF tokens, or RTMS. [Learn more](/docs/meeting-sdk/obf-faq/).

The Meeting SDK for Windows might return errors in the callbacks or as return values. This
list provides a description of possible error codes and how to mitigate
them. If you receive an error code, cross-check here to get the
semantics of the error and how to resolve it.

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## Talkback error codes

| Name                            | Error Code | Description                                                |
| ------------------------------- | ---------- | ---------------------------------------------------------- |
| `TALKBACK_ERROR_OK`             | `0`        | Operation successful.                                      |
| `TALKBACK_ERROR_NOPERMISSION`   | `1`        | Permission denied.                                         |
| `TALKBACK_ERROR_ALREADY_EXIST`  | `2`        | Object already exists. The user is already in the channel. |
| `TALKBACK_ERROR_COUNT_OVERFLOW` | `3`        | Channel count exceeds limit.                               |
| `TALKBACK_ERROR_NOT_EXIST`      | `4`        | Object does not exist.                                     |
| `TALKBACK_ERROR_REJECTED`       | `5`        | Operation rejected.                                        |
| `TALKBACK_ERROR_TIMEOUT`        | `6`        | Operation timeout.                                         |
| `TALKBACK_ERROR_UNKNOWN`        | `7`        | Unknown error.                                             |

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