In performing an audit of Sitecore logs, I came across a slew of Aggregation Errors on the Processing Server all complaining about a definition not found.
1172 11:08:41 ERROR Aggregation Error
Exception: System.Exception
Message: Definition not found: itemId: '{28A4B856-37C1-446C-B0C1-E56F78252AA0}' culture: 'Invariant Language (Invariant Country)' type: 'Sitecore.Marketing.Definitions.Campaigns.ICampaignActivityDefinition'
Source: Sitecore.ExperienceAnalytics
at Sitecore.ExperienceAnalytics.Aggregation.Pipeline.SegmentProcessor.ProcessSegments(AggregationPipelineArgs args, IEnumerable`1 segments)
at Sitecore.ExperienceAnalytics.Aggregation.Pipeline.SegmentProcessor.OnProcess(AggregationPipelineArgs args)
at Sitecore.Analytics.Aggregation.Pipeline.AggregationProcessor.Process(AggregationPipelineArgs args)
Nested Exception
Exception: System.InvalidOperationException
Message: Definition not found: itemId: '{28A4B856-37C1-446C-B0C1-E56F78252AA0}' culture: 'Invariant Language (Invariant Country)' type: 'Sitecore.Marketing.Definitions.Campaigns.ICampaignActivityDefinition'
Source: Sitecore.ExperienceAnalytics
at Sitecore.ExperienceAnalytics.Core.Repositories.ClassificationResolver`1.GetClassificationUris(ID itemId)
at Sitecore.ExperienceAnalytics.Aggregation.Dimensions.CampaignFacetBase.HasDimensionKey(IVisitAggregationContext context)
at Sitecore.ExperienceAnalytics.Aggregation.Dimensions.CampaignFacetBase.<GetData>d__3.MoveNext()
at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
at Sitecore.ExperienceAnalytics.Aggregation.Pipeline.SegmentProcessor.ProcessSegments(AggregationPipelineArgs args, IEnumerable`1 segments)
The Item Guid in Question points to a Campaign Item:
Every error in the log seems to point just to this item.
Has anyone seen this before?