XML database invalid

During oracle upgrade of 12c to 19c we are facing th3 below issue

Elapsed: 00:00:00.03

10:49:10 SQL> grant select,insert,update,delete on XDB.XDB$CONFIG to dba;

grant select,insert,update,delete on XDB.XDB$CONFIG to dba

                     *

ERROR at line 1:

ORA-00942: table or view does not exist

Oracle XML Database

  ORA-00942: table or view does not exist

  ORA-00942: table or view does not exist

  ORA-00942: table or view does not exist

  ORA-01403: no data found

  ORA-06512: at line 18

  ORA-31114: XDB configuration has been deleted or is corrupted

  ORA-06512: at "SYS.DBMS_STATS", line 40799

  ORA-06512: at "SYS.DBMS_STATS", line 40083

  ORA-06512: at "SYS.DBMS_STATS", line 38960