我正在尝试安装Dashing gem，但是在终端中显示以下内容。我正在关注tutorial from DevCasts：
EtienneLo: user1$ rails g dashing:install
warning: parser/current is loading parser/ruby25, which recognizes
warning: 2.5.1-compliant syntax, but you are running 2.5.0.
warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.
We are preparing the algo
Could not find generator 'dashing:install'. Maybe you meant 'devise:install', 'merit:install' or 'bootstrap:install'
我已经安装了gem，并且已经运行了bundle install命令