Trying to run a Oozie job but from running to killed changing due to the error described. Can anyone please explain any solution req

[#1]

Error un-registering AM client
java.lang.NullPointerException
  at org.apache.hadoop.yarn.client.api.impl.AMRMClientImpl.unregisterApplicationMaster(AMRMClientImpl.java:613)
  at org.apache.hadoop.yarn.client.api.async.impl.AMRMClientAsyncImpl.unregisterApplicationMaster(AMRMClientAsyncImpl.java:220)
  at org.apache.oozie.action.hadoop.LauncherAM.unregisterWithRM(LauncherAM.java:359)
  at org.apache.oozie.action.hadoop.LauncherAM.run(LauncherAM.java:285)
  at org.apache.oozie.action.hadoop.LauncherAM$1.run(LauncherAM.java:156)
  at java.security.AccessController.doPrivileged(Native Method)
  at javax.security.auth.Subject.doAs(Subject.java:422)
  at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1898)
  at org.apache.oozie.action.hadoop.LauncherAM.main(LauncherAM.java:144)
Callback notification attempts left 0
Callback notification trying http://ln000xhstm0002.federated.fds:11000/oozie/callback?id=0000046-231010100945447-oozie-oozi-W@spa...
Callback notification to http://ln000xhstm0002.federated.fds:11000/oozie/callback?id=0000046-231010100945447-oozie-oozi-W@spa... succeeded
Callback notification succeeded

[#2]

Dear Support any replies are appreciated.

Thanks.