NullReferenceException when trying to set class property

Question

Basically I have 2 classes, \"Manifest\" and \"BrowserAction\", set out like this:

public class BrowserAction
{
    public string default_icon {get; set;}
    pu         


        

Answer 1

You've initialised newManifest, but browser_action is still null (presumably).

You are then trying to set default_popup on the null browser_action and getting the exception

newManifest.browser_action.default_popup = "popup.html";