java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.atlassian.clover.ant.groovy.GroovycSupport.buildTestDetector(GroovycSupport.java:242)
at com.atlassian.clover.ant.groovy.GroovycSupport.taskStarted(GroovycSupport.java:141)
at org.apache.tools.ant.Project.fireTaskStarted(Project.java:2184)
at org.apache.tools.ant.Task.perform(Task.java:344)
at org.apache.tools.ant.Target.execute(Target.java:392)
at org.apache.tools.ant.Target.performTasks(Target.java:413)

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