All errors codes returned by the API.

| Enums ||
|---|---|
| `ERROR_CODE_UNSPECIFIED` | Missing error code. |
| `SHARES_PUBSUB_TOPIC_MESSAGE_ACROSS_VERSIONS` | The pub/sub topic name provided in the 'updateNotificationSetting' rpc is being used by other versions of this API. Please supply a new topic name to mitigate this issue. |
| `PUBLISH_PERMISSIONS_MISSING_FOR_PUBSUB_TOPIC` | The pub/sub topic name supplied for update notification setting doesn't have publish permissions for the user. |
| `INVALID_PUBSUB_TOPIC` | The pub/sub topic name supplied for update notification setting is invalid. |