Server wasn't able to start properly Strapi / Heroku / Postgresql

I have another problem. So my Production Strapi is online, but I can’t login with my username, because it is asking for a e-mail adress and I tried everything.

For local: I deleted ssl: { rejectUnauthorized: env.bool('DATABASE_SSL_SELF', false), // For self-signed certificates }
out of config/database.js and when I start strapi locally the admin page is just empty.

I don’t know what to do. Please help me