Deduplicator actions fail and "An error occurred while updating the entries. See the inner exception for details. ---> Invalid column name 'DuplicateHashValue'." error is logged after upgrading from eDiscovery Bundle version 3.4 to 3.6 with Best Practices.
The 'ZyLABDeduplicator' database schema hasn't been updated.
The eDiscovery Bundle Best Practices 3.6 installation guide steps that apply to your deployment need to be followed in full. Please note that when you run the "04_Create_ZyLABDeduplicatorDatabase.sql" script, the old 'ZyLABDeduplicator' database will be dropped and a new one, compatible with 3.6, will be created. You can backup the old database to save the data, but you won't be able to use the old 'ZyLABDeduplicator' schema on 3.6.