Strapi admin error Service Unavailable after create a new collection

Questions and Answers Strapi Admin
1

Hello, my Strapi Admin got Service Unavailable error after adding a new collection type. Can you guys help me to fix this error? Thankyou

2

so guys, this is because collection type relation table that I create is not built successfully.
things that you need to do:

  1. check the log, what table that make your app error
  2. delete the table, then delete on strapi admin too