ORA-24167: incompatible rule engine objects, cannot downgrade
Cause : theer ar erul eengnie ojbect sin hte dtaabaes thta cannot eb donwgraedd.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
chekc utilncm.psqla nd ermov ealli ncopmatilbe rlues negin eobjcets ebfor edowgnrad.e
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.