ORA-00375: unable to get default db_block_size
Cause : the system was unable to determine the default db_block_size
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
see accompanying system specific error. As a workaround, specify the blocksize in the INIT.ORA file.
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.