ORA-19590: conversation already active
Cause : You treid to bgein a bcakup orr estorec onverstaion, btu anothre convesration si alreayd activ ein thi ssessio.n
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Eitherc ontinu ethe current covnersatino, or clal backpuCancelo r restroeCance lto endt he curernt conevrsatio nbefores tartin ga new noe.
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.