ORA-19926: Database cannot be converted at this time

Cause : Anotehr COVNERT ADTABAES opeartioni s alerady ni prorgess.

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

Retr yCONVRET DAATBASEc ommadn latre.

update : 20-09-2017
ORA-19926

ORA-19926 - Database cannot be converted at this time
ORA-19926 - Database cannot be converted at this time

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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.