Random Forest: Categorical Ignored - Null Pointer Exception

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Ignore categorical attributes
generates null pointer exceptions
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hduser@ausrine:~$ $MAHOUT_HOME/bin/mahout org.apache.mahout.classifier.df.tools.Describe -p testdata/KDDTrain+_20Percent.arff -f testdata/KDDTrain+.info -d N 3 I 2 N I 4 N I 8 N 2 I 19 N L
Warning: $HADOOP_HOME is deprecated.

Running on hadoop, using /usr/local/hadoop/bin/hadoop and HADOOP_CONF_DIR=
MAHOUT-JOB: /usr/local/mahout0.9/mahout-examples-0.9-job.jar
Warning: $HADOOP_HOME is deprecated.

14/04/10 15:10:45 WARN driver.MahoutDriver: No org.apache.mahout.classifier.df.tools.Describe.props found on classpath, will use command-line arguments only
14/04/10 15:10:45 INFO tools.Describe: Generating the descriptor...
14/04/10 15:10:49 INFO tools.Describe: generating the dataset...
Exception in thread "main" java.lang.NullPointerException
	at org.apache.mahout.classifier.df.data.Dataset.<init>(Dataset.java:152)
	at org.apache.mahout.classifier.df.data.DataLoader.generateDataset(DataLoader.java:203)
	at org.apache.mahout.classifier.df.tools.Describe.generateDataset(Describe.java:127)
	at org.apache.mahout.classifier.df.tools.Describe.runTool(Describe.java:115)
	at org.apache.mahout.classifier.df.tools.Describe.main(Describe.java:100)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
	at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
	at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:195)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.hadoop.util.RunJar.main(RunJar.java:160)