Caused by: java.lang.NullPointerException at com.cenqua.clover.tasks.CloverReportTask.cloverExecute(CloverReportTask.java:368) at com.cenqua.clover.tasks.AbstractCloverTask.execute(AbstractCloverTask.java:46) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105) with <historical outfile="${clover.dest}" historydir="${clover.history}" title="PMD Historical"> </historical>