Web Development with Clojure, Third Edition: (create-migration "guestbook") not working (page 9)

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When I try the command to create a pair of migration files I get an error.

user=> (create-migration "guestbook")
Execution error (IllegalArgumentException) at user/create-migration (user.clj:61).
find not supported on type: mount.core.DerefableState

user=>

Linux Ubuntu 20.04 LTS, OpenJDK 14.0.2

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