# Miscellaneous Solutions & Notes ## Error messages ### 500s loading /admin/instances From s0 on Server & Upgrading chat, 2023-02-17: #### Error ``` ActiveRecord::StatementInvalid: PG::ObjectNotInPrerequisiteState: ERROR: materialized view "instances" has not been populated HINT: Use the REFRESH MATERIALIZED VIEW command. ``` #### Solution Went into postgres on mastodon_production and ran refresh materialized view instances