I have upgraded Postgres to 12.1, PostGIS to 3.0 and PGAdmin to 4.15. Running queries and using PGAdmin GUI results in some error messages:
ERROR: column rel.relhasoids does not exist LINE 1: SELECT rel.relhasoids AS has_oids
Error retrieving data from the server: INTERNAL SERVER ERROR String indices must be integers
What am I missing that will solve these errors?