Client scripts or UI Policies throws error ReferenceError: HelloWorld is not defined when tring to call a Script Include - Support and Troubleshooting

Client scripts or UI Policies throws error ReferenceError: HelloWorld is not defined when tring to call a Script Include Issue  Symptoms Cannot instantiate a Script Include object from a client script. Error in console displays something like:

ReferenceError: HelloWorld is not defined

Where HelloWorld is the name of the Script Include

On the Client Script or UI Policy, we may have something like

var obj = new HelloWorld();

Release All

Cause The problem is the way client code is being prepared to call the Script Include

var obj = new HelloWorld()

is not the correct way to instantiate a Script Include object

Resolution The correct way to call a Script Include from a Client Script, or other client side code like UI Policies, is to use a GlideAjax object like so:

var ga = new GlideAjax("HelloWorld")

Additional Information https://docs.servicenow.com/csh?topicname=c_GlideAjaxAPI.html&version=latest