Description

During the publishing of Sitecore templates that have sub-items and related items, a System.ArgumentException error might occur:

[Error] Error in the VariantsValidationTargetProducer
System.ArgumentException: An item with the same key has already been added.
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 Sitecore.Framework.Publishing.ManifestCalculation.VariantsValidationTargetProducer.CandidatePromotionContext.CalculatePublishActions(Boolean replaceUnmodifedVariants)
at Sitecore.Framework.Publishing.ManifestCalculation.VariantsValidationTargetProducer.Emit(CandidatePromotionContext context)
at Sitecore.Framework.Publishing.ManifestCalculation.VariantsValidationTargetProducer.ProcessCandidate(CandidatePromotionContext context)
at Sitecore.Framework.Publishing.ManifestCalculation.VariantsValidationTargetProducer.<Initialize>b__12_0(IList`1 ctxs)

This issue affects Sitecore Publishing Service 2.2 Update-1 - 3.1 Update-2, and 4.0.0.

Solution

To resolve the issue, consider one of the following options:

• Upgrade the Publishing Service module to one of the following product versions:
  • Sitecore Publishing Service 3.1 Update-3
  • Sitecore Publishing Service 4.1 Initial Release
• If the upgrading is not currently possible, download and install the patch compatible with the affected product version found on this page:

  
  https://github.com/SitecoreSupport/Sitecore.Support.40925/releases.