Specifying :tasks key causes Unable to resolve symbol: deftask

[devn]

project.clj:
...
:tasks [foo.tasks]
...

foo/src/foo/tasks.clj:
(ns foo.tasks)
(deftask hello-world
(println "hello world."))

$ cake help

Exception in thread "main" java.lang.Exception: Unable to resolve symbol: deftask in this context (tasks.clj:3)
at clojure.lang.Compiler.analyze(Compiler.java:5200)
at clojure.lang.Compiler.analyze(Compiler.java:5146)
at clojure.lang.Compiler$InvokeExpr.parse(Compiler.java:3031)
at clojure.lang.Compiler.analyzeSeq(Compiler.java:5366)

[lancepantz]

Try (ns foo.tasks (:use cake) )

[ninjudd]

closing