A story that an error occurred when trying to deploy with heorku.

ver. 'rails', '~> 6.0.0'

When I tried to deploy the created app, I got an Appliation error. errorimage

Solutions

First, try heroku logs --tail, which is also displayed in the image, at the terminal. Then it will tell you where the error is occurring.

After a lot of research, I found that the master.key file, which should be paired with the credentials.yml.enc file, did not exist in VScode.

Therefore, once I quit VScode and restarted, the master.key file appeared successfully, so I was able to resolve the error!

Before deploying, I would like to check once if the necessary files exist so that such an error does not occur again.

It's okay to type commands as per the article, but I don't recommend doing rails new as per the article! is what they said.

Certainly, it is a command to create a new application template, so if you try rails new once again, it will look like Matryoshka. I'll be careful.