Property 'subscribe' does not exist on type 'void'.

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Javascript

Typescript

I have button to pass value to the database in typescript. I got error in my use.component.ts subscribe does not exist on type void. Here'my code

//user.componet.html

//user.component.ts
onSubmit(form: NgForm) {
    this.insertRecord(form)
}

insertRecord(form: NgForm) {
    this.service.postUser(form.value).subscribe(response => {
        this.resetForm(form);
    });
}

I tries to import 'Observable' from 'rxjs' and import 'rxjs/add/operator/map' but it didn't work. How to fix this?

What I have tried:

import { Observable } from 'rxjs';

import 'rxjs/add/operator/map';