1，启动 rails s 的时候 !! Rack application returned nil body. Probably you wanted it to be an empty string? !! Unexpected error while processing request: undefined method `each' for nil:NilClass css 和 js 都无法访问

2，启动

bundle exec sidekiq -c config/sidekiq.yml

出现如下错误

invalid value for Integer(): "config/sidekiq.yml"