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I've been following a tutorial and hit an error where there wasn't one in the book. I have reinstalled leinigen, updated java and reinstalled cider on emacs.

But doesn't seem to help and I can't find this error message online. Running M-x "cider-jack-in" to open a REPL gives me the error message:

"Symbol’s function definition is void: sesman-current-sessions"

and I can't figure out what's causing this, any help is gratefully received.

Edward Whitehead
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2 Answers2

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I ran into the same problem. It's possible that you're using an old version of the sesman package. Updating cider for me didn't update the sesman dependency.

For example, sesman-20180903.1826 doesn't define sesman-current-sessions while sesman-20181109.1100 does. Updating sesman fixed the issue for me.

Josh Mōller-Mara
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Can you post your project.clj file? Maybe it contains old versions of libraries that are either conflicting with the newest CIDER.

A typical minimal project.clj from a fresh new project created with lein new app myapp will look like this:

(defproject myapp "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "EPL-2.0 OR GPL-2.0-or-later WITH Classpath-exception-2.0"
            :url "https://www.eclipse.org/legal/epl-2.0/"}
  :dependencies [[org.clojure/clojure "1.9.0"]]
  :main ^:skip-aot overflow.core
  :target-path "target/%s"
  :profiles {:uberjar {:aot :all}})
Denis Fuenzalida
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  • Denis, to your question on the other answer, it's "Clojure for the brave and true", and for your answer it's literally the bog standard "lein new app myapp" and i changed one print statement (but it works via "lein run") – Edward Whitehead Jan 21 '19 at 13:20
  • ***edit*** I'm an idiot, had to run cider under project.clj not core.clj – Edward Whitehead Jan 21 '19 at 13:29