R12 upgrade - adworker fails with error ORA-20000: Unable to analyze INDEX "EGO"."EGO_MTL_SY_ITEMS_E

Hi

Getting below error when adworker tries to run EGOEXTCONC.sql

ERROR at line 1:
ORA-20000: Unable to analyze INDEX "EGO"."EGO_MTL_SY_ITEMS_EXT_B_U1",
insufficient privileges or does not exist
ORA-06512: at "SYS.DBMS_STATS", line 18341
ORA-06512: at "SYS.DBMS_STATS", line 18402
ORA-06512: at line 1
ORA-06512: at "APPS.FND_STATS", line 711
ORA-06512: at "APPS.FND_STATS", line 1836
ORA-06512: at line 91

I have checked that the index "EGO"."EGO_MTL_SY_ITEMS_EXT_B_U1" does not exist.

Please let me know how to proceed further without skipping this adworker because the script EGOEXTCONC.sql must complete sucessfully.