DatabaseException(Error Domain=FMDatabase Code=1 "no such table: contacts"

Estou com o seguinte erro: [VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: DatabaseException(Error Domain=FMDatabase Code=1 "no such table: contacts" UserInfo={NSLocalizedDescription=no such table: contacts}) sql 'INSERT INTO contacts (id, tarefas) VALUES (?, ?)' args [0, rafa]}

main:

void main() {
  runApp(MyApp());
  save(Tarefas(0, 'rafa')).then((id) {
    findAll().then((tarefas) => debugPrint(tarefas.toString()));
  });
}


classe:


class Tarefas{
  final int id;
  final String tarefa;

  Tarefas(this.id, this.tarefa);

  @override
  String toString(){
    return tarefa;

  }
}


database:


import 'package:mkneumorphicflutter/models/Tarefas.dart';
import 'package:path/path.dart';
import 'package:sqflite/sqflite.dart';

Future<Database> createDatabase(){
  return getDatabasesPath().then((dbPath) {
    final String path = join(dbPath, 'markTime.db');
//    deleteDatabase(path);
    return openDatabase(path, onCreate: (db, version){
      db.execute('CREATE TABLE contacts('
          'id INTEGER PRIMARY KEY, '
          'tarefas TEXT, ');
    }, version: 1);
  });
}

Future<int> save(Tarefas contact) {
  return createDatabase().then((db) {
    final Map<String, dynamic> contactMap = Map();
    contactMap['id'] = contact.id;
    contactMap['tarefas'] = contact.tarefa;
    return db.insert('contacts', contactMap);
  });
}

Future<List<Tarefas>> findAll() {
  return createDatabase().then((db) {
    return db.query('contacts').then((maps) {
      final List<Tarefas> contacts = List();
      for (Map<String, dynamic> map in maps) {
        final Tarefas contact = Tarefas(
          map['id'],
          map['tarefas']
        );
        contacts.add(contact);
      }
      return contacts;
    });
  });
}