Enum describing possible ad group feed errors.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/errors/ad_group_feed_error.proto)

| Enums ||
|---|---|
| ## `ADGROUP_FEED_ALREADY_EXISTS` | The AdGroupFeed already exists. UPDATE operation should be used to modify the existing AdGroupFeed. |
| ## `CANNOT_CREATE_FOR_REMOVED_FEED` | The specified feed is removed. |
| ## `CANNOT_OPERATE_ON_REMOVED_ADGROUP_FEED` | Cannot operate on removed AdGroupFeed. |
| ## `FEED_ALREADY_EXISTS_FOR_PLACEHOLDER_TYPE` | An active feed already exists for this ad group and place holder type. |
| ## `INVALID_PLACEHOLDER_TYPE` | Invalid placeholder type. |
| ## `MISSING_FEEDMAPPING_FOR_PLACEHOLDER_TYPE` | Feed mapping for this placeholder type does not exist. |
| ## `NO_EXISTING_LOCATION_CUSTOMER_FEED` | Location AdGroupFeeds cannot be created unless there is a location CustomerFeed for the specified feed. |
| ## `UNKNOWN` | The received error code is not known in this version. |
| ## `UNSPECIFIED` | Enum unspecified. |