i keep getting the error undefined variable. where am i going wrong?

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i cant seem to find whats the problem im trying to create a simple ease scroll effect im using the jQuery pluging easing.js ans well as jquery-1.11.0.min.js

$(function(){
        //catch all clicks
        $("a").click(function(){
            // check if it has a #
            if(this.hash){
                // get rid of the # sign
                var hash = this.hash.substr(1);
                // get position ofd the links name
                var $toElement = $("a[name="+hash+"]");
                var toPosition = $toElement.position().top;
                // scroll animate to postion
                $("body,html").animate({
                    scrollTop : toPosition
                },2000,"easeOutExpo");
                return false;
            }
        });
    });

and even when i try it like this i still get the same error:

        $(function(){
        //catch all clicks
        $("a").click(function(){
            // check if it has a #
            if(this.hash){
                // get rid of the # sign
                var hash = this.hash.substr(1);
                // get position ofd the links name
                var $toElement = $("a[name="+hash+"]");
                var $toPosition = $toElement.position().top;
                // scroll animate to postion
                $("body,html").animate({
                    scrollTop : toPosition
                },2000,"easeOutExpo");
                return false;
            }
        });
    });

asked 48 secs ago

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