ModalPopupExtender Error

Question

Hello Sir,

I am trying the code of attached file in my project, and it is successfully running in my local machine but when I'm deploying my project on remote server then this page shows following Error

Server Error in '/mahasamund/JKKYKM' Application.

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The control with ID 'ModalPopupExtenderIndex' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.

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.InvalidOperationException: The control with ID 'ModalPopupExtenderIndex' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.