Using gradle-2.2-rc-1, using the OneJar plugin fails with an error:

FAILURE: Build failed with an exception.

• Where:
  Build file 'C:\data\gradle\gradle-22-onejar\build.gradle' line: 13

• What went wrong:
  A problem occurred evaluating root project 'gradle-22-onejar'.
  > Could not create task of type 'OneJar'.

Excerpts from stack trace:

• Exception is:
  org.gradle.api.GradleScriptException: A problem occurred evaluating root project 'gradle-22-onejar'.
  at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:54)
  Caused by: org.gradle.api.tasks.TaskInstantiationException: Could not create task of type 'OneJar'.
  at org.gradle.api.internal.project.taskfactory.TaskFactory$1.call(TaskFactory.java:126)
  Caused by: java.lang.NullPointerException
  at org.gradle.api.internal.BeanDynamicObject$MetaClassAdapter.hasProperty(BeanDynamicObject.java:135)
  at org.gradle.api.internal.BeanDynamicObject.hasProperty(BeanDynamicObject.java:102)
  at org.gradle.api.internal.CompositeDynamicObject.getProperty(CompositeDynamicObject.java:77)
  at com.github.rholder.gradle.task.OneJar_Decorated.getProperty(Unknown Source)
  at org.codehaus.groovy.runtime.callsite.PogoGetPropertySite.getProperty(PogoGetPropertySite.java:47)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:231)
  at com.github.rholder.gradle.task.OneJar.<init>(OneJar.groovy:48)
  at com.github.rholder.gradle.task.OneJar_Decorated.<init>(Unknown Source)

• Reproducable gradle.build: [1]http://pastebin.com/2X1CaX04
• Stack trace (-S): [2]http://pastebin.com/dEeRSzM6
• Plugin source code: [3]https://github.com/rholder/gradle-one...
  ----------------------------------------------------------------------------------------
  [1] http://pastebin.com/2X1CaX04
  [2] http://pastebin.com/dEeRSzM6
  [3] https://github.com/rholder/gradle-one-jar/blob/v1.0.4/src/main/groovy/com/github/rholder/gradle/task/OneJar.groovy