How to use "new ResourcesSearch"

Hi I'm trying to do multiple searches using visualize.js and I followed the guide which said to do

new ResourcesSearch({
    server:"http://localhost:8080/jasperserver-pro",
    folderUri: "/public",
    recursive: false
    })).run(function(resourceLookups){
        // results here
});

However I get the error "ResourcesSearch is not defined". I looked at this link which referenced the tutorial video. However in the tutorial they use v.resourcesSearch. I can't seem to get "new ResourcesSearch" to work and I'm not sure what I'm doing wrong