data-bind attribute is not working in knockout js

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Razor

Knockout.js

i am trying to learn knockout js and in my project i have used razor view and trying to bind a text to a span tag. but when i run the application, it gives a javascript error on the knockout js file as "JavaScript runtime error: Unable to get property 'nodeType' of undefined or null reference" and doesn't show the data bind value of the span. i am unable to figure out what i am missing. Someone plz help me in this. below is the code i have used.
@section scripts
{


var obj = { name: "my name" };
ko.applyBindings(obj);

}