Enum describing possible ad group ad 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_group_ad_error.proto)

| Enums ||
|---|---|
| ## `AD_GROUP_AD_LABEL_ALREADY_EXISTS` | The label has already been attached to the adgroup ad. |
| ## `AD_GROUP_AD_LABEL_DOES_NOT_EXIST` | No link found between the adgroup ad and the label. |
| ## `AD_NOT_UNDER_ADGROUP` | The specified ad was not found in the adgroup |
| ## `AD_SHARING_NOT_ALLOWED` | Ad sharing is not allowed. |
| ## `AD_TYPE_CANNOT_BE_PAUSED` | AdGroupAds with the given ad type cannot be paused. |
| ## `AD_TYPE_CANNOT_BE_REMOVED` | AdGroupAds with the given ad type cannot be removed. |
| ## `CANNOT_CREATE_DEPRECATED_ADS` | An ad of this type is deprecated and cannot be created. Only deletions are permitted. |
| ## `CANNOT_CREATE_TEXT_ADS` | Text ads are deprecated and cannot be created. Use expanded text ads instead. |
| ## `CANNOT_OPERATE_ON_REMOVED_ADGROUPAD` | Removed ads may not be modified |
| ## `CANNOT_UPDATE_DEPRECATED_ADS` | An ad of this type is deprecated and cannot be updated. Only removals are permitted. |
| ## `DURATION_TOO_SHORT` | The duration of the AdGroupAd is too short. |
| ## `EMPTY_FIELD` | A required field was not specified or is an empty string. |
| ## `RESOURCE_REFERENCED_IN_MULTIPLE_OPS` | An ad may only be modified once per call |
| ## `UNKNOWN` | The received error code is not known in this version. |
| ## `UNSPECIFIED` | Enum unspecified. |