新手问题 ruby-chna 源代码本地安装后，注册新用户报错
按照 github 的文档和https://ruby-china.org/topics/27691 用 vagrant 的方式搭建 Ruby China 开发环境 注册新用户时报这个错误
Redis::CommandError in AccountController#create
ERR wrong number of arguments for 'zadd' command
在运行 ./bin/setup 时出现了这种提示，不知道是否有关系。
Seed default data...[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
[DEPRECATION] `last_comment` is deprecated. Please use `last_description` instead.
Database 'ruby-china-dev' already exists
Database 'ruby-china-test' already exists
[Done]
== Removing old logs and tempfiles ==
Ruby China Successfully Installed.
No reference
