SomeOne know this error Log's referral number: 9a4b2455-e674-4d4c-8334-1f078e2d60ac ???

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com.atlassian.cache.CacheException: com.atlassian.jira.exception.DataAccessException: org.ofbiz.core.entity.GenericDataSourceException: SQL Exception while executing the following:SELECT SOURCE_NODE_ID, SOURCE_NODE_ENTITY, SINK_NODE_ID, SINK_NODE_ENTITY, ASSOCIATION_TYPE, SEQUENCE FROM public.nodeassociation WHERE SOURCE_NODE_ID=? AND SOURCE_NODE_ENTITY=? AND SINK_NODE_ENTITY=? AND ASSOCIATION_TYPE=? (ERROR: relation "public.nodeassociation" does not exist
  Position: 108)

Nic Brough -Adaptavist-

The log referral number is a reference for your admins and Atlassian to uniquely identify the log the real error was written to.

We can't tell you anything, you need to read your application log file (atlassian-jira.log in <jira-home>/logs) to find out what the actual error was.