i am tring to use kettle to invoke sqoop tasks; but i meet a problem.

i can browse hdfs path in kettle spoon, i was tring to use sqoop to load some data from RDBMS to hdfs,

when i start kettle job, i found this:
Name:  1.jpg
Views: 123
Size:  25.5 KBName:  2.jpg
Views: 104
Size:  43.5 KB





There was an error during job execution

java.lang.NullPointerException
at org.pentaho.big.data.kettle.plugins.job.JobEntrySerializationHelper.loadRep(JobEntrySerializationHelper.java:478)
at org.pentaho.big.data.kettle.plugins.job.AbstractJobEntry.loadRep(AbstractJobEntry.java:128)
at org.pentaho.big.data.kettle.plugins.sqoop.AbstractSqoopJobEntry.loadRep(AbstractSqoopJobEntry.java:126)
at org.pentaho.di.repository.kdr.delegates.KettleDatabaseRepositoryJobEntryDelegate.compatibleJobEntryLoadRep(KettleDatabaseRepositoryJobEntryDelegate.java:200)
at org.pentaho.di.repository.kdr.delegates.KettleDatabaseRepositoryJobEntryDelegate.loadJobEntryCopy(KettleDatabaseRepositoryJobEntryDelegate.java:165)
at org.pentaho.di.repository.kdr.delegates.KettleDatabaseRepositoryJobDelegate.loadJobMeta(KettleDatabaseRepositoryJobDelegate.java:455)
at org.pentaho.di.repository.kdr.KettleDatabaseRepository.loadJob(KettleDatabaseRepository.java:326)
at org.pentaho.di.ui.spoon.job.JobGraph.startJob(JobGraph.java:3461)
at org.pentaho.di.ui.spoon.delegates.SpoonJobDelegate.executeJob(SpoonJobDelegate.java:1422)
at org.pentaho.di.ui.spoon.Spoon.executeJob(Spoon.java:8544)
at org.pentaho.di.ui.spoon.Spoon.executeFile(Spoon.java:8505)
at org.pentaho.di.ui.spoon.Spoon.runFile(Spoon.java:8470)
at org.pentaho.di.ui.spoon.job.JobGraph.runJob(JobGraph.java:3391)
at org.pentaho.di.ui.spoon.job.JobGraph$11.widgetSelected(JobGraph.java:1426)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1347)
at org.pentaho.di.ui.spoon.Spoon.waitForDispose(Spoon.java:7989)
at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:9269)
at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:662)
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.pentaho.commons.launcher.Launcher.main(Launcher.java:92)





Does someone know how to use sqoop with kettle? please give me some clue. thanks!