Enum describing possible ad parameter 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/ad_parameter_error.proto)

| Enums ||
|---|---|
| ## `AD_GROUP_CRITERION_MUST_BE_KEYWORD` | The ad group criterion must be a keyword criterion. |
| ## `INVALID_INSERTION_TEXT_FORMAT` | The insertion text is invalid. |
| ## `UNKNOWN` | The received error code is not known in this version. |
| ## `UNSPECIFIED` | Enum unspecified. |