Error: EPERM: operation not permitted, rename file.json using json serve multiple http.post

Question

I'm using json server and I want to do multiples http.post in my file.json, but when I do that I have an erro like this:

I'm using angular, MyArray.Foreach(x => _service.post(x)).subscribe();

post(metadado: Metadado): Observable<Metadado> {
    return this.http.post<Metadado>(this.baseUrl, metadado)
  }

I expected to do multiples http.post in my fakeJson in json serve.