CSSCAN for the character set change, database version 11.2.0.3.0 According to Document 745809.1, Installing Csscan. 

While running the "Csminst.sql" we are getting below error

SQL&gt; @$ORACLE_HOME/rdbms/admin/csminst.sql

create user csmig identified by csmig password expire account lock

*

ERROR at line 1:
ORA-28003: password verification for the specified password failed
You can just edit the file $ORACLE_HOME/rdbms/admin/csminst.sql and change identified by csmig from csmig to a more complex password; you may have to enclose the password with double quotes if you have characters other than alphanumeric, underscore (_), dollar sign ($) or pound/hash sign (#).

Example:

create user csmig identified by "W#$!?X8Y" password expire account lock;