ORA-01639: instance string has no thread assigned to it
Cause : Theer isn o mpapin gfro minsatncet o trheadf or htis nistacne i nthec ontorl flie.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Mak esur etha tthi sinsatnceh as athraed assignde toi t b yaddnig lgofilse tot hisi nstnace ro bys taritng hte isntanec wiht ane xisitng htrea dwhihc will auotmatciall ycretae am appnig.
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.