# Error 3021: This operation cannot be performed with a running slave io thread

| Error Code | SQLSTATE | Error                                      | Description                                                                                                          |
| ---------- | -------- | ------------------------------------------ | -------------------------------------------------------------------------------------------------------------------- |
| 3021       |          | ER\_SLAVE\_CHANNEL\_IO\_THREAD\_MUST\_STOP | This operation cannot be performed with a running slave io thread; run STOP SLAVE IO\_THREAD FOR CHANNEL '%s' first. |

## Possible Causes and Solutions

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