Enum describing possible conversion custom variable errors.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/errors/conversion_custom_variable_error.proto)

| Enums ||
|---|---|
| ## `DUPLICATE_NAME` | A conversion custom variable with the specified name already exists. |
| ## `DUPLICATE_TAG` | A conversion custom variable with the specified tag already exists. |
| ## `RESERVED_TAG` | A conversion custom variable with the specified tag is reserved for other uses. |
| ## `UNKNOWN` | The received error code is not known in this version. |
| ## `UNSPECIFIED` | Enum unspecified. |