Calling observer.complete() is required after observer.error()?

I am writing an observable in Angular 2. My code is something like:

Observable.create(observer => {
    // fetched something from web service
    if (some condition) {
        observer.next('something');
        observer.complete();
    }
    else { // error with no data
        observer.error('something else');
        observer.complete(); // Is this required here? Or can I skip this in case of error() ?
    }
});