Error::while creating an alert in asp.net using C#

Hi,

I am creating operators,Alerts and jobs through asp.net using c#.
so some times while i am creating "Alerts" i am getting one error like this

[MicroSoft][ODBC ServerDriver][SQL Server] The specified @.Message_id('499') does not exist.

i am not understanding what its mean, any on can help me to do this

Thx,
Raj.Could you post a small standalone compileable reproduction of this issue, so we can take a closer look?