ORA-25502: concurrent ALTER SYSTEM QUIESCE/UNQUIESCE command is running
Cause : There is a concurrent ALTER SYSTEM QUIESCE RESTRICTED or ALTER SYSTEM UNQUIESCE command running in the system.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Contact the database administrator who is responsible for the concurrent command.
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.