Help with deployed application.

[teejayem]

I have created an asp.net web application. It works fine when running
it from visual studio.

I have now installed it on my pc using the web deployment project so
that other users can access the web page but i get an error saying

Object reference not set to an instance of an object.

This is relating to an object instance based on my cdata class which
is the datalayer for my page.

This only happens it i type in http://localhost/deployed application
If i run from VS it runs perfectly

any ideas?