Add annotation to MessagePopup class for whitelisting.
package org.terasology.rendering.nui.layers.mainMenu;
import org.terasology.assets.ResourceUrn;
+import org.terasology.module.sandbox.API;
import org.terasology.rendering.nui.CoreScreenLayer;
import org.terasology.rendering.nui.WidgetUtil;
import org.terasology.rendering.nui.widgets.ActivateEventListener;
/**
*/
+@API
public class MessagePopup extends CoreScreenLayer {
public static final ResourceUrn ASSET_URI = new ResourceUrn("engine:messagePopup!instance");
