A database error has occurred. Did you forget to run maintenance/update.php after upgrading? See: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script
Query: INSERT INTO "objectcache" (keyname,value,exptime) VALUES ('Wiki:messages:en:lock','\313\2642\264\006\000','2019-02-18 14:35:34 GMT')
Function: DatabasePostgres::insert
Error: 1 ERROR: duplicate key value violates unique constraint "objectcache_keyname_key"
DETAIL: Key (keyname)=(Wiki:messages:en:lock) already exists.