Blank Page at localhost 4000 / admin

Hi I followed contribution guide strapi/ at master · strapi/strapi · GitHub
But after starting admin for port 4000 it is showing a blank page. Please help

System Information
  • Strapi Version: 3.3.2
  • Operating System: Mac OS catalina, 10.15.6
  • Database: i guess i started without any, so sqllite must have been picked
  • Node Version: 14.15
  • NPM Version: 6.14.8
  • Yarn Version: 1.22.5

why don’t you follow the official guide?