jython create work manager but I get the new attribute not found error how can i fix this

I was created array from text file in jython for use the wlst scripts. But jython scripts finished with error. The error I get is as follows

import sys import os import jarray import dircache from java.io import File from java.lang import String myPropertyFile = "workManagerProperties.properties" def connection(): print '===> Connecting as '+ username + ' To WebLogic URL ' + url + '...' try: connect(username, password, url) except WLSTException: print '==> Error Connecting to The URL ' + url CancelEdit('y') exit() loadProperties(myPropertyFile) url=protocol + '://' + host + ':' + AdminPort connection() def main(): edit() startEdit() cd ('/Clusters') Clusters = cmo.getClusters() for clusters in Clusters: svr = clusters.getName() print svr input=open("/oracle12c/scripts/BS_WM_multiple.txt",'r') m=input.readlines() input.close() z=[] for v in m: z.append(v) print z[0] a=0 for i in z: workManagerName=z[a] print '======= Creating a WorkManager name as =======' cd('edit:/SelfTuning/' + domainName + '/WorkManagers/') create(workManagerName,'WorkManagers') cd('edit:/SelfTuning/' + domainName + '/WorkManagers/') cd(workManagerName) ls('a') set('Targets',jarray.array([ObjectName('com.bea:Name='+svr+',Type=Cluster')], ObjectName)) save() print ' WorkManager Created...' a=a+1 save() activate(block="true") main() disconnect() 

weblogic scripting tools jython scripts finished with error,The error I get is as follows.How can I fix this. This is the last point I come to. My already created attribute gives an error as not created.

======= Creating a WorkManager name as ======= MBean type WorkManager with name BPM_POST_AUTO_CHARGE_ORDER_INFO_BS_WM has been created successfully. BPM_POST_AUTO_CHARGE_ORDER_INFO_BS_WM drw- BPM_POST_AUTO_CHARGE_ORDER_INFO_BS_WM Problem invoking WLST - Traceback (innermost last): File "/oracle12c/scripts/wm_create/wm_test.py", line 52, in ? File "/oracle12c/scripts/wm_create/wm_test.py", line 45, in main File "<iostream>", line 165, in cd File "<iostream>", line 553, in raiseWLSTException WLSTException: Error occurred while performing cd : Attribute BPM_POST_AUTO_CHARGE_ORDER_INFO_BS_WM not found. Use ls('a') to view the attributes