Why this exception occurred in ASP.Net?

Question

Dear All,

I created a registration page in ASP.net and added some validation,When I compile the code

"

WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'. Please add a ScriptResourceMapping named jquery(case-sensitive).

"

 

this exception  is occurred. What is the solution?

 

Thank in Advance