Errror: Property 'setConfig' does not exist

[usman-coeus-solutions]

NotificationService.setConfig({
position: 'top/bottom',
type: 'info/success/warn/error/grimace/default',
duration: 4000,
sticky: true/false,
})
where should i add default configuration of my angular app.Its give error when I try to add this in onInit like this
NotificationService.setConfig({
position: 'top',
type: 'default',
duration: 4000,
sticky: true,
});
give me this error
ERROR in ng2-notify-popup-test/src/app/app.component.ts (16,25): Property 'setConfig' does not exist on type 'typeof NotificationService'.

@shubhi1407