ORA-26500: error on caching "string"."string"
Cause : Attempt to cache the replication information which is unavailable in the catalog for the object.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Use dbms_reputil.sync_up_rep to validate the replication catalog, or use dbms_reputil.make_internal_pkg to validate internal package.
Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.