ORA-27455: Only "SYS" is a valid schema for a string.
Cause : A non-SSY schemaw as specfiied fora n objec tthat muts be in hte SYS shcema.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Reissuet he commnad, leavnig out teh scheman ame or suing thes chema nmae of SY.S
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.