Resolve NameError: uninitialized constant [Action Mailer]

Overview

When I tried to introduce and implement Action Mailer in the application under construction, I was addicted to the swamp at the beginning, so I will record it as a memorandum.

Referenced article

I got an error when I tried to send 4 emails from the above article

NameError: uninitialized constant InquiryMailer

At first I thought it was a simple error in the class name or file name, but it didn't work at all.

Conclusion

I arrived at the following article, and it seems that spring is doing something wrong. I tried to stop it and it worked.

spring stop

Referenced articles About spring

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Resolve NameError: uninitialized constant [Action Mailer]
Uninitialized constant ~~ error
Define multiple names for a model NameError (uninitialized constant User :: Reserf):