> ## Documentation Index
> Fetch the complete documentation index at: https://cometchat-22654f5b-docs-agent-native-development.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Error Codes

> Review CometChat Notification API error codes for authentication, providers, push tokens, preferences, and delivery logs.

Error codes specific to the Notification APIs.

## Authentication Errors

| Error Code | Description |
| - | - |
| `AUTH_ERR_EMPTY_APIKEY` | The `apikey` header is missing from the request. |
| `AUTH_ERR_APIKEY_NOT_FOUND` | The provided API key is invalid. |
| `AUTH_ERR_NO_ACCESS` | The API key doesn't have the required scope for this operation. |

## Provider Errors

| Error Code | Description |
| - | - |
| `ERR_PROVIDER_NOT_FOUND` | The specified provider does not exist. |
| `ERR_PROVIDER_ALREADY_EXISTS` | A provider with the same configuration already exists. |

## Push Token Errors

| Error Code | Description |
| - | - |
| `ERR_TOKEN_NOT_FOUND` | The specified push token does not exist. |
| `ERR_TOKEN_ALREADY_EXISTS` | The push token is already registered. |

## General Errors

| Error Code | Description |
| - | - |
| `ERR_BAD_REQUEST` | Validation error in the request body. |
| `ERR_OPERATION_FAILED` | The operation failed due to a server error. |


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