https://stackoverflow.com/questions/70849954/undefined-method-mechanism-for-activesupportdependenciesmodule-nomethoder

error：undefined method `mechanism=' for ActiveSupport::Dependencies:Module
解决：

I recently upgraded an to Rails 7.0.1 and I ran into this same issue. I saw this same error when trying to run 

rails console
.

I got past it when I removed 

spring-watcher-listen
from the Gemfile (because it was preventing 
spring
from updating past 
2.x
) and then bumped 
spring
to 
3.0.0
in the Gemfile. Then I ran 
bundle
and 
rails console
worked again.