Research:WestGrid:Reprocessing: sam cannot find the name zhiyil

When I submit jobs (d0 data p20 reprocessing) to westgrid, once my keberos expired, I have to type my password again to re-create keberos certificate. However, even I type correct password, I was still given the following error: zhiyil cannot be found.

The solution should be:
kdestroy
and
remove the file /tmp/PROXY_zhiyil

But sometimes they are not working. Confused....
==============
Traceback (most recent call last):
File "/export/D0_products/ups/prd/jim_client/NULL/v3_0_1/bin/samg", line 179, in ?
sys.exit(main(sys.argv))
File "/export/D0_products/ups/prd/jim_client/NULL/v3_0_1/bin/samg", line 175, in main
command_function(arguments)
File "samg_submit.py", line 262, in samg_submit
File "samg_submit.py", line 133, in translate
File "samg_submit.py", line 157, in translateDoc
File "/export/D0_products/ups/prd/jim_client/NULL/v3_0_1/lib/jim_client/mergejob.py", line 862, in checkSemantic
samgjob.Doc.checkSemantic(self)
File "/home/parag/wspace/samgrid/V7/JIMSUITE/jim_client/lib/jim_client/samgjob.py", line 828, in checkSemantic
File "/export/D0_products/ups/prd/jim_client/NULL/v3_0_1/lib/jim_client/mergejob.py", line 887, in createAttribute
attr = Attribute.factory(token, self.context)
File "/export/D0_products/ups/prd/jim_client/NULL/v3_0_1/lib/jim_client/mergejob.py", line 515, in factory
newDefname,snapId=context.createDatasetfromDimension(tokenValue)
File "/export/D0_products/ups/prd/jim_client/NULL/v3_0_1/lib/jim_client/mergejob.py", line 326, in createDatasetfromDimension
sam_user = jim_client_util.getUserName()
File "/home/parag/wspace/samgrid/V7/JIMSUITE/jim_client/lib/jim_client/jim_client_util.py", line 177, in getUserName
File "sam_common_pylibSamCommand/BlessedCommandInterfacePlaceHolder.py", line 81, in __call__
File "sam_common_pylibSamCommand/CommandInterface.py", line 251, in __call__
File "sam_common_pylibSamCommand/SamCommandInterface.py", line 243, in apiWrapper
File "sam_user_pyapi/src/samUtility.py", line 317, in implementation
File "sam_common_pylibSamCorba/SamServerProxy.py", line 257, in _callRemoteMethod
File "sam_common_pylibSamCorba/SamServerProxyRetryHandler.py", line 266, in handleCall
SamException.SamExceptions.PersonNotFound: GridSubject with name '/DC=gov/DC=fnal/O=Fermilab/OU=People/CN=Zhiyi Liu/USERID=zhiyil' not found.

Research: remove merged files on Westgrid

Once files produced on Westgrid have been merged, should remember to remove for keeping durable space light. To do this:

1. Log in blackhole by my account same as SFU's
2. sudo su sam (run this for getting permission, note!! input my SFU password)
   
3. Go to Yann's directory (home)
4. Run the clean script.