There are many reasons to cause this issue. I have noted here few for you


  1. Check All Analytics dll’s should have same version (8.1 or 8.2 and specific number)
  2. You should not have two facets with same name in config file
  3. Unique cluster name in Sitecore.Analytics.Tracker.config

<setting name=”Analytics.ClusterName” value=”default-cd-cluster” />

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