What does the exception below mean? Does trampoline require something to be 
defined/included that the usual way doesn't?

Exception in thread "main" java.lang.IllegalArgumentException: No 
implementation of method: :make-writer of protocol: 
#'clojure.java.io/IOFactory found for class: nil (NO_SOURCE_FILE:0)
    at clojure.lang.Compiler.eval(Compiler.java:5440)
    at clojure.lang.Compiler.eval(Compiler.java:5391)
    at clojure.core$eval.invoke(core.clj:2382)
    at clojure.main$eval_opt.invoke(main.clj:235)
    at clojure.main$initialize.invoke(main.clj:254)
    at clojure.main$script_opt.invoke(main.clj:270)
    at clojure.main$main.doInvoke(main.clj:354)
    at clojure.lang.RestFn.invoke(RestFn.java:483)
    at clojure.lang.Var.invoke(Var.java:381)
    at clojure.lang.AFn.applyToHelper(AFn.java:180)
    at clojure.lang.Var.applyTo(Var.java:482)
    at clojure.main.main(main.java:37)
Caused by: java.lang.IllegalArgumentException: No implementation of method: 
:make-writer of protocol: #'clojure.java.io/IOFactory found for class: nil
    at clojure.core$_cache_protocol_fn.invoke(core_deftype.clj:471)
    at clojure.java.io$fn__7420$G__7374__7427.invoke(io.clj:63)
    at clojure.java.io$writer.doInvoke(io.clj:113)
    at clojure.lang.RestFn.invoke(RestFn.java:411)
    at clojure.lang.AFn.applyToHelper(AFn.java:163)
    at clojure.lang.RestFn.applyTo(RestFn.java:133)
    at clojure.core$apply.invoke(core.clj:542)
    at clojure.core$spit.doInvoke(core.clj:5385)
    at clojure.lang.RestFn.invoke(RestFn.java:426)
    at leiningen.trampoline$write_trampoline.invoke(trampoline.clj:32)
    at leiningen.trampoline$trampoline.doInvoke(trampoline.clj:57)
    at clojure.lang.RestFn.invoke(RestFn.java:426)
    at clojure.lang.Var.invoke(Var.java:369)
    at clojure.lang.AFn.applyToHelper(AFn.java:165)
    at clojure.lang.Var.applyTo(Var.java:482)
    at clojure.core$apply.invoke(core.clj:542)
    at leiningen.core$apply_task.invoke(core.clj:228)
    at leiningen.core$_main.doInvoke(core.clj:294)
    at clojure.lang.RestFn.applyTo(RestFn.java:140)
    at clojure.core$apply.invoke(core.clj:542)
    at leiningen.core$_main.invoke(core.clj:297)
    at user$eval42.invoke(NO_SOURCE_FILE:1)
    at clojure.lang.Compiler.eval(Compiler.java:5424)
    ... 11 more

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