Clojurians Log v2

Sorry simple noob question: what am I doing wrong; Trying to use postgres, it was working but I can't get it reworking! Error:

Execution error (IllegalArgumentException) at datahike.store/eval23474$fn (store.cljc:23). Can't delete a store with scheme: pg

config:

(def cfg {:store {:backend :pg :host "localhost" :port 5432 :username "postgres" :password "postgres" :dbname "pg_example" :name "db"  :schema-flexibility :write}})