ERROR [2014-12-08 17:39:11,037] main - riemann.bin - Couldn't start
java.lang.RuntimeException: No such namespace: acknowledgement, compiling:(/etc/riemann/riemann.config:25:1)
        at clojure.lang.Compiler.analyze(Compiler.java:6464)
        at clojure.lang.Compiler.analyze(Compiler.java:6406)
        at clojure.lang.Compiler$InvokeExpr.parse(Compiler.java:3665)
        at clojure.lang.Compiler.analyzeSeq(Compiler.java:6646)
        at clojure.lang.Compiler.analyze(Compiler.java:6445)
        at clojure.lang.Compiler.analyze(Compiler.java:6406)
        at clojure.lang.Compiler$BodyExpr$Parser.parse(Compiler.java:5782)
        at clojure.lang.Compiler$FnMethod.parse(Compiler.java:5217)
        at clojure.lang.Compiler$FnExpr.parse(Compiler.java:3846)
        at clojure.lang.Compiler.analyzeSeq(Compiler.java:6642)
        at clojure.lang.Compiler.analyze(Compiler.java:6445)
        at clojure.lang.Compiler.eval(Compiler.java:6700)
        at clojure.lang.Compiler.load(Compiler.java:7130)
        at clojure.lang.Compiler.loadFile(Compiler.java:7086)
        at clojure.lang.RT$3.invoke(RT.java:318)
        at riemann.config$include.invoke(config.clj:349)
        at riemann.bin$_main.invoke(bin.clj:68)
        at riemann.bin$_main.invoke(bin.clj:59)
        at clojure.lang.AFn.applyToHelper(AFn.java:154)
        at clojure.lang.AFn.applyTo(AFn.java:144)
        at riemann.bin.main(Unknown Source)
Caused by: java.lang.RuntimeException: No such namespace: acknowledgement
        at clojure.lang.Util.runtimeException(Util.java:221)
        at clojure.lang.Compiler.resolveIn(Compiler.java:6910)
        at clojure.lang.Compiler.resolve(Compiler.java:6884)
        at clojure.lang.Compiler.analyzeSymbol(Compiler.java:6845)
        at clojure.lang.Compiler.analyze(Compiler.java:6427)