[Google Maps API v2] main.js:41 Uncaught TypeError:Object#<object> has no method 'Load'

The registered user of my web app defines the destination on the
google map and and person who enter the source location will get the
direction map on our web app. It was working fine, when are pushing
the data from a dynamic page to a site page. we are unable to get the
direction we are able to see default maps from google.

I have added the code here and also the exception I am getting

Error Name:
main.js:41 Uncaught TypeError:Object#<object> has no method 'Load'

function calcRoute() {
showDirections();
document.getElementById('directionsPanel').innerHTML="";
initialize();
var start = document.getElementById("txt_from").value;
var end =
getDestinationAdderss(document.getElementById('final_address').innerHTML);
var request = {
origin:start,
destination:end,
travelMode: google.maps.DirectionsTravelMode.DRIVING
};
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
}
});

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