ORA-26506: null global context
Cause : An internal buffer control structure was NULL
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Verify that sufficient memory resources are available to RepAPI.
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.