AdWords API Fatal Error (AdWords Editor)

[lix...@2ndaddress.com]

Can someone please explain to me what this error message means and how to fix it? 

[Milind Sankeshware (AdWords API Team)]

Hi,

The ACTIVE_ADGROUP_FEEDS_PER_ACCOUNT limit applies to non-removed AdGroupFeed objects in an account. If a set of FeedItems are added as extensions to N AdGroups, it counts as N ad group-level extensions. To free up the space, you need to REMOVE the AdGroupFeeds for your REMOVED adGroups using AdGroupFeedService, then retry your request. Please check the system limits in AdWords here. The error is due to your API operation exceeding the said limit of 250,000 ad group-level extensions per account. Let me know if you have further questions.

Thanks,
Milind, AdWords API Team.