I am using hdp23, when i run my pentaho mapreduce job, i got following error, what is the matter? How can I debug such errors? Thanks in advance!

2016-10-26 20:58:07,586 INFO [AsyncDispatcher event handler] org.apache.hadoop.yarn.util.RackResolver: Resolved host19522 to /default-rack
2016-10-26 20:58:07,587 INFO [AsyncDispatcher event handler] org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl: attempt_1476192097407_0079_m_000000_2 TaskAttempt Transitioned from UNASSIGNED to ASSIGNED
2016-10-26 20:58:07,587 INFO [RMCommunicator Allocator] org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Assigned container container_1476192097407_0079_01_000004 to attempt_1476192097407_0079_m_000000_2
2016-10-26 20:58:07,587 INFO [RMCommunicator Allocator] org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Recalculating schedule, headroom=<memory:14336, vCores:1>
2016-10-26 20:58:07,587 INFO [RMCommunicator Allocator] org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: Reduce slow start threshold not met. completedMapsForReduceSlowstart 1
2016-10-26 20:58:07,587 INFO [RMCommunicator Allocator] org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: After Scheduling: PendingReds:1 ScheduledMaps:0 ScheduledReds:0 AssignedMaps:1 AssignedReds:0 CompletedMaps:0 CompletedReds:0 ContAlloc:3 ContRel:0 HostLocal:1 RackLocal:0
2016-10-26 20:58:07,592 INFO [ContainerLauncher #4] org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncherImpl: Processing the event EventType: CONTAINER_REMOTE_LAUNCH for container container_1476192097407_0079_01_000004 taskAttempt attempt_1476192097407_0079_m_000000_2
2016-10-26 20:58:07,592 INFO [ContainerLauncher #4] org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncherImpl: Launching attempt_1476192097407_0079_m_000000_2
2016-10-26 20:58:07,592 INFO [ContainerLauncher #4] org.apache.hadoop.yarn.client.api.impl.ContainerManagementProtocolProxy: Opening proxy : host19522:45454
2016-10-26 20:58:07,671 INFO [ContainerLauncher #4] org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncherImpl: Shuffle port returned by ContainerManager for attempt_1476192097407_0079_m_000000_2 : 13562
2016-10-26 20:58:07,672 INFO [AsyncDispatcher event handler] org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl: TaskAttempt: [attempt_1476192097407_0079_m_000000_2] using containerId: [container_1476192097407_0079_01_000004 on NM: [host19522:45454]
2016-10-26 20:58:07,672 INFO [AsyncDispatcher event handler] org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl: attempt_1476192097407_0079_m_000000_2 TaskAttempt Transitioned from ASSIGNED to RUNNING
2016-10-26 20:58:08,590 INFO [RMCommunicator Allocator] org.apache.hadoop.mapreduce.v2.app.rm.RMContainerRequestor: getResources() for application_1476192097407_0079: ask=1 release= 0 newContainers=0 finishedContainers=0 resourcelimit=<memory:14336, vCores:1> knownNMs=2
2016-10-26 20:58:14,156 INFO [Socket Reader #1 for port 58314] SecurityLogger.org.apache.hadoop.ipc.Server: Auth successful for job_1476192097407_0079 (auth:SIMPLE)
2016-10-26 20:58:14,189 INFO [IPC Server handler 0 on 58314] org.apache.hadoop.mapred.TaskAttemptListenerImpl: JVM with ID : jvm_1476192097407_0079_m_000004 asked for a task
2016-10-26 20:58:14,189 INFO [IPC Server handler 0 on 58314] org.apache.hadoop.mapred.TaskAttemptListenerImpl: JVM with ID: jvm_1476192097407_0079_m_000004 given task: attempt_1476192097407_0079_m_000000_2
2016-10-26 20:58:20,594 INFO [IPC Server handler 28 on 58314] org.apache.hadoop.mapred.TaskAttemptListenerImpl: Progress of TaskAttempt attempt_1476192097407_0079_m_000000_2 is : 0.0
2016-10-26 20:58:20,616 FATAL [IPC Server handler 26 on 58314] org.apache.hadoop.mapred.TaskAttemptListenerImpl: Task: attempt_1476192097407_0079_m_000000_2 - exited : java.io.IOException: org.pentaho.di.core.exception.KettleException:
Output step not defined in transformation

at org.pentaho.hadoop.mapreduce.PentahoMapRunnable.run(PentahoMapRunnable.java:496)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:453)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: org.pentaho.di.core.exception.KettleException:
Output step not defined in transformation

at org.pentaho.hadoop.mapreduce.PentahoMapRunnable.run(PentahoMapRunnable.java:476)
... 7 more

2016-10-26 20:58:20,616 INFO [IPC Server handler 26 on 58314] org.apache.hadoop.mapred.TaskAttemptListenerImpl: Diagnostics report from attempt_1476192097407_0079_m_000000_2: Error: java.io.IOException: org.pentaho.di.core.exception.KettleException:
Output step not defined in transformation

at org.pentaho.hadoop.mapreduce.PentahoMapRunnable.run(PentahoMapRunnable.java:496)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:453)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: org.pentaho.di.core.exception.KettleException:
Output step not defined in transformation

at org.pentaho.hadoop.mapreduce.PentahoMapRunnable.run(PentahoMapRunnable.java:476)
... 7 more

2016-10-26 20:58:20,618 INFO [AsyncDispatcher event handler] org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl: Diagnostics report from attempt_1476192097407_0079_m_000000_2: Error: java.io.IOException: org.pentaho.di.core.exception.KettleException:
Output step not defined in transformation

at org.pentaho.hadoop.mapreduce.PentahoMapRunnable.run(PentahoMapRunnable.java:496)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:453)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: org.pentaho.di.core.exception.KettleException:
Output step not defined in transformation

at org.pentaho.hadoop.mapreduce.PentahoMapRunnable.run(PentahoMapRunnable.java:476)
... 7 more