Errors during Apply retention policies

[wgv-bedwards (Bryce Edwards)]

We started getting this error a few weeks ago. We are on version 2019.4.2

System.ArgumentException
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
   at Octopus.Core.PackageMetadata.PackageMetadataCleaner.<>c.<Execute>b__6_2(IGrouping`2 packageReferenceGroup)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
   at Octopus.Core.PackageMetadata.PackageMetadataCleaner.Execute(ICollection`1 packagesUsedByReleases, CancellationToken cancellationToken)
   at Octopus.Server.Orchestration.ServerTasks.ApplyRetentionPolicies.ApplyRetentionPoliciesTaskController.ApplyPackageRetention()
   at Octopus.Server.Orchestration.ServerTasks.ApplyRetentionPolicies.ApplyRetentionPoliciesTaskController.Execute()
   at Octopus.Server.Orchestration.ServerTasks.RunningTask.RunMainThread() ```

[wgv-bedwards (Bryce Edwards)]

Well, I just found https://github.com/OctopusDeploy/Issues/issues/5473

[henrik (Henrik Andersson)]

Hi Bryce,

Thanks for getting in touch.

As you found, we’ve shipped a fix for that issue in 2019.4.3.

Cheers,
Henrik