Rails命令给出错误

Question

我在终端机（Mac El Capitan）上运行'rails -v'命令时遇到非常奇怪的错误，它向我显示错误：

/Users/paras/.rvm/gems/ruby-2.3.0/bin/rails:22:in `<main>': undefined method `activate_bin_path' for Gem:Module (NoMethodError)
from /Users/paras/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `eval'
from /Users/paras/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `<main>'
Parass-MacBook-Pro:hackathon_1 paras$ rails -v
/Users/paras/.rvm/gems/ruby-2.3.0/bin/rails:22:in `<main>': undefined method `activate_bin_path' for Gem:Module (NoMethodError)
from /Users/paras/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `eval'
from /Users/paras/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `<main>'

以及当我运行“ rails s”时。 重新安装滑轨后，我得到以下信息：

== 20160404103035 CreateEvents: migrating =====================================
-- create_table(:events) rake aborted! 
StandardError: An error has occurred, this and all later migrations canceled:
 PG::UndefinedTable: ERROR: relation "users" does not exist : 
ALTER TABLE "events" ADD CONSTRAINT "fk_rails_0cb5590091" FOREIGN KEY ("user_id") /Users/paras/.rvm/gems/ruby-2.3.0@hackathon_1/gems/activerecord-4.2.5/lib/active‌​_record/connection_adapters/postgresql/database_statements.rb:155:in `async_exec' 

还有更多类似上述内容的行，其中包含不同的消息。

请帮我。

Answer 1

看起来这可能是Rubygems 2.6.2和Ruby 2.3.0的问题。 参见https://github.com/bundler/bundler/issues/4381和https://github.com/bundler/bundler/issues/4402 。

通过gem update --system 2.6.1使用Rubygems 2.6.1并重新安装Rails gem可能会为您解决问题。