In general, conflicts error occurs when multiple sessions updates concurrently the same contents.
In that case, Session A got error "OakState0001"
Session B finished at 01:10 => complete with success.
Session A finished at 01:15 => got error "OakState0001"
Search "OakState0001: Unresolved conflicts in" in error.log.
Find when error occurred and which contents were conflicted.
Summary: Review for concurrent session updates to find what is conflicted.
Same operation was trigerred in a short time.
Customized workflow or jsp being used wiithout consideration of session management.