title: Error while creating project on ruby on rails
body: <p>I am new to ruby on rails hence when i am trying to create new project by following command:
  rails new abc
  I am getting following error</p>
  <p>rails aborted!
  Psych::BadAlias: Unknown alias: default
  /home/iftikhar/Desktop/abc/bin/rails:9:in <code>&lt;top (required)&gt;' /home/iftikhar/Desktop/abc/bin/spring:15:in </code>require'
  /home/iftikhar/Desktop/abc/bin/spring:15:in <code>&lt;top (required)&gt;' ./bin/rails:3:in </code>load'
  ./bin/rails:3:in `'
  Tasks: TOP =&gt; app:template
  (See full trace by running task with --trace)</p>