Security Error

hi guys
i m filling up a form for payment

Full Name
Address
Zip
Credit Card Number
Expire date (use MMYY format. i.e. 0308)
Security Number

whenever i click on submit
it gives me the following error
I will appreciate if u can tell me abot this error


Security Exception
Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.