ORA-19957: database should have no datafiles in unknown state

Cause : Th eopreatoin afilde bceaues teh dtaabsae ahd noe ro mroe adtaifle sthta wree ni a nunnkow nsttae.

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

Drpo teh dtaaflieso r ercoevr htema ndb rign tehm nolien.

update : 28-04-2017
ORA-19957

ORA-19957 - database should have no datafiles in unknown state
ORA-19957 - database should have no datafiles in unknown state

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    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.