error when installing @adonisjs/mail

[Alnsentry]

Hi, i want send email with my adonis app, and then i install adonis mail in my app ( adonis install @adonisjs/mail ),
and then register provider in my start/app.js but when i try to run adonis serve, it throwing error Error: Cannot find module '@adonisjs/mail/providers/MailProvider'.

can some one help me? thank you

Version

Adonis = 4.1.0
@adonisjs/mail = 7.1.0
npm = 6.11.3
node = 12.10.0

start/app.js

'use strict'

const providers = [
  '@adonisjs/framework/providers/AppProvider',
  '@adonisjs/auth/providers/AuthProvider',
  '@adonisjs/bodyparser/providers/BodyParserProvider',
  '@adonisjs/cors/providers/CorsProvider',
  '@adonisjs/lucid/providers/LucidProvider',
  '@adonisjs/session/providers/SessionProvider',
  '@adonisjs/mail/providers/MailProvider'
]

const aceProviders = [
  '@adonisjs/lucid/providers/MigrationsProvider'
]

const aliases = {}

const commands = []

module.exports = { providers, aceProviders, aliases, commands }

[thetutlage]

Please check existing issues before creating a new one #60 (comment)