Add `gem 'sqlite3'` to your Gemfile

 

 

 

 

错误：Specified 'sqlite3' for database adapter, but the gem is not loaded. Add `gem 'sqlite3'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord). (Gem::LoadError)

 

 

 

解决办法：将Gemfile文件里的gem "sqlite3"改为gem "sqlite3", "~> 1.3.6”