| 1000 | Generic error | |
| 1001 | Message too long | Message length exceeds 4096 characters |
| 1002 | Invalid recipient type | Valid recipient types are: individual, group |
| 1003 | Not a group participant | User is not a participant of the group |
| 1004 | Resource already exists | Possible UUID conflict for media upload request or media with that UUID already exists |
| 1005 | Access denied | Media directory is not writable (upload request) or Invalid credentials or VName Certificate Error or App Expired: a version upgrade is required |
| 1006 | Resource not found | File or resource not found |
| 1007 | Recipient blocked to receive message | Recipient is not whitelisted |
| 1008 | Required parameter is missing | Missing a required parameter |
| 1009 | Parameter value is not valid | Value entered for a parameter is of the wrong type or other problem |
| 1010 | Parameter is not required | Contains parameter that is not required |
| 1011 | Service not ready | |
| 1012 | Group is unknown | You will receive this error when you send messages to a group in which you are the only member. Add some members to the group before sending messages. |
| 1013 | User is not valid | |
| 1014 | Internal error | Upload failed on bad image (image not uploaded correctly) or endpoint not found |
| 1015 | Too many requests | |
| 1016 | System overloaded | If the system is under heavy load, this error is returned to allow the system to recover from the load. |
| 1017 | Not Primary Master | You receive this error when a master-only request, such as set settings, get settings, import, export, code request, register, etc. is sent to a node that is not a primary master. This could happen when the WhatsApp Business API Client is not setup properly or internal errors. Retrying the request should resolve this error most of time. If not, please contact us for support. |
| 1018 | Not Primary Coreapp | You receive this error when requests are sent to a Coreapp node that is not the shard owner or in the process to become the shard owner. You might see this error when we are doing shard failover in the multiconnect setup. Retrying the request should resolve this error most of time. If not, please contact Support. |
| 1019 | Not a group admin | |
| 1020 | Bad group | |
| 1021 | Bad User | You will receive this message when you send a message to yourself. To resolve, send the message to number that is not your own. |
| 1022 | Webhooks URL is not configured | You will receive this error if you have not configured the REST API Webhooks format. |
| 1023 | Database error occurred | |