MySQL not working with rails app

Question

I'm getting the error displayed on the image whenever I try to deploy my project. I have a rails app and a MySQL database. I've configured the following ENV variables:

  database: &lt;%= ENV["MYSQLDATABASE"] %&gt;
  username: &lt;%= ENV["MYSQLUSER"] %&gt;
  password: &lt;%= ENV["MYSQLPASSWORD"] %&gt;
  port: &lt;%= ENV["MYSQLPORT"] %&gt;
  host: &lt;%= ENV["MYSQLHOST"] %&gt;

I've also noticed that my MYSQLHOST variable is empty.

In addition, this project already has an schema, how can I load the tables in the MySQL on Railway?