Getting nREPL exception when debugging Clojure

[didibus]

Exception in thread "nREPL-worker-0" java.lang.ClassCastException: clojure.tools.nrepl.middleware.load_file$wrap_load_file$fn$reify__668 cannot be cast to clojure.tools.nrepl.transport.Transport
    at clojure.tools.nrepl.middleware.pr_values$pr_values$fn$reify__1053.send(pr_values.clj:23)
    at clojure.tools.nrepl.middleware.interruptible_eval$evaluate$fn__1087$fn__1102.invoke(interruptible_eval.clj:122)
    at clojure.main$repl$fn__7108.invoke(main.clj:260)
    at clojure.main$repl.doInvoke(main.clj:258)
    at clojure.lang.RestFn.invoke(RestFn.java:1523)
    at clojure.tools.nrepl.middleware.interruptible_eval$evaluate$fn__1087.invoke(interruptible_eval.clj:87)
    at clojure.lang.AFn.applyToHelper(AFn.java:152)
    at clojure.lang.AFn.applyTo(AFn.java:144)
    at clojure.core$apply.invoke(core.clj:630)
    at clojure.core$with_bindings_STAR_.doInvoke(core.clj:1868)
    at clojure.lang.RestFn.invoke(RestFn.java:425)
    at clojure.tools.nrepl.middleware.interruptible_eval$evaluate.invoke(interruptible_eval.clj:85)
    at clojure.tools.nrepl.middleware.interruptible_eval$interruptible_eval$fn__1132$fn__1135.invoke(interruptible_eval.clj:222)
    at clojure.tools.nrepl.middleware.interruptible_eval$run_next$fn__1127.invoke(interruptible_eval.clj:190)
    at clojure.lang.AFn.run(AFn.java:22)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)