Clojail invokation error

gistfile1.txt

In clojail.clj:

(ns ca.gsimard.spacecraft.client.clojail
  (:use [clojail core testers])
  (:gen-class
    :name ca.gsimard.spacecraft.client.clojail
    :methods [#^{:static true} [epadEval [String] String]
              #^{:static true} [getAction [] String]]))

In main.java:
println("Epad: " + clojail.epadEval("(+ 1 2 3)"))

On PC1 (Linux):

Epad: 6

On PC2 (Windows 7):

Result:
Exception in thread "main" java.lang.ExceptionInInitializerError
        at clojure.lang.Namespace.<init>(Namespace.java:34)
        at clojure.lang.Namespace.findOrCreate(Namespace.java:176)
        at clojure.lang.Var.internPrivate(Var.java:149)
        at ca.gsimard.spacecraft.client.clojail.<clinit>(Unknown Source)
        at ca.gsimard.spacecraft.client.Epad$.eval(EpadClient.scala:78)
        at ca.gsimard.spacecraft.client.Main$.main(MainClient.scala:25)
        at ca.gsimard.spacecraft.client.Main.main(MainClient.scala)
Caused by: java.lang.NullPointerException
        at clojure.core$eval1697$fn__1698.invoke(core.clj:6135)
        at clojure.core$eval1697.invoke(core.clj:6135)
        at clojure.lang.Compiler.eval(Compiler.java:6465)
        at clojure.lang.Compiler.load(Compiler.java:6902)
        at clojure.lang.RT.loadResourceScript(RT.java:357)
        at clojure.lang.RT.loadResourceScript(RT.java:348)
        at clojure.lang.RT.load(RT.java:427)
        at clojure.lang.RT.load(RT.java:398)
        at clojure.lang.RT.doInit(RT.java:434)
        at clojure.lang.RT.<clinit>(RT.java:316)
        ... 7 more