Call to undefined function views_build_view()

Hi folks,

I have the following code that I copied from another forum post.

                $myview = views_get_view('archive-block');
                $viewarg = "";
                //set the view argument $args[0] to your_variable before building the view
                $myview_args = array(0 => $viewarg);
                $myview_args = array();
                print views_build_view('block', $myview, $myview_args, false, 4);

But the above code is throwing the following error:

Call to undefined function views_build_view()

I actually created a archive view that I want to re-use based on the page context. I want to be able to pass parameter to my particular view.

Please help!

Thanks!