AI-generated Key Takeaways
- 
          The content lists and describes possible errors related to ad group feeds. 
- 
          Errors include issues with existing feeds, operating on removed feeds, invalid placeholder types, and missing feed mappings. 
- 
          Some errors specifically relate to location-based feeds and the necessity of a corresponding customer feed. 
Enum describing possible ad group feed errors.
| Enums | |
|---|---|
| 
 | Enum unspecified. | 
| 
 | The received error code is not known in this version. | 
| 
 | An active feed already exists for this ad group and place holder type. | 
| 
 | The specified feed is removed. | 
| 
 | The AdGroupFeed already exists. UPDATE operation should be used to modify the existing AdGroupFeed. | 
| 
 | Cannot operate on removed AdGroupFeed. | 
| 
 | Invalid placeholder type. | 
| 
 | Feed mapping for this placeholder type does not exist. | 
| 
 | Location AdGroupFeeds cannot be created unless there is a location CustomerFeed for the specified feed. |