National Institute Of Open Schooling — I am not able to register the school

Address:	793114
Website:	NIOS

I have submitted the school registration and all the column have been filled up as per instruction in the column but after submitting it does not register but show error like this
Server error in '/' application.

Violation of primary key constraint 'pk_school_1'. Cannot insert duplicate key in object 'dbo. School'. The duplicate key value is ([protected]).
The statement has been terminated.

Description: an unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception details: system. Data. Sqlclient. Sqlexception: violation of primary key constraint 'pk_school_1'. Cannot insert duplicate key in object 'dbo. School'. The duplicate key value is ([protected]).
The statement has been terminated.

Source error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack trace:

[sqlexception (0x[protected]: violation of primary key constraint 'pk_school_1'. Cannot insert duplicate key in object 'dbo. School'. The duplicate key value is ([protected]).
The statement has been terminated.]
Dbaccess. Db. Executesql (String sql) in c:\nios_deled\dbaccess\db. Cs:105
Nios. Deled. Schoolregister. Submit_clicked (Object sender, eventargs e) in c:\nios_deled\nios_deled\schoolregister. Aspx. Cs:140
System. Web. Ui. Webcontrols. Button. Raisepostbackevent (String eventargument) +155
System. Web. Ui. Page. Processrequestmain (Boolean includestagesbeforeasyncpoint, boolean includestagesafterasyncpoint) +3804
Can you help solve this problem