[rules-users] Commons-logging configurations errors. WHY?

Hi, this error seams to be caused by commons-logging api, take a look at http://www.qos.ch/logging/thinkAgain.jsp Exception in thread "main" java.lang.ExceptionInInitializerError at org.drools.compiler.PackageBuilder.loadCompiler(Unknown Source) at org.drools.compiler.PackageBuilder.<init>(Unknown Source) at org.drools.compiler.PackageBuilder.<init>(Unknown Source) at nova.common.session.GenericSession.configTaskData(GenericSession.java:225) at nova.common.session.GenericSession.initSession(GenericSession.java:77) at nova.test.entity.client.TestFrameTask.initSession(TestFrameTask.java:268) at nova.common.task.FrameTask.init(FrameTask.java:12) at nova.test.entity.client.TestFrameTask.init(TestFrameTask.java:90) at nova.common.task.SimpleLauncher.launchTask(SimpleLauncher.java:65) at nova.common.task.SimpleLauncher.main(SimpleLauncher.java:25) Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException) (Caused by org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException)) at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543) at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235) at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209) at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:353) at org.apache.commons.jci.compilers.EclipseJavaCompiler.<clinit>(EclipseJavaCompiler.java:52) ... 10 more