title: Error installing a django project AttrributeError: module 'collections' has no attribute 'Iterator'
body: <p>i am trying to use this project <a href="https://github.com/tangjon/Build-a-PC-Configuration-Tool" rel="nofollow noreferrer">https://github.com/tangjon/Build-a-PC-Configuration-Tool</a> but i have an error in the process. First of all i am cloning the project using this command:</p>
  <pre><code>git clone https://github.com/tangjon/Build-a-PC-Configuration-Tool.git
  </code></pre>
  <p>after that i am changing directory and go to:</p>
  <pre><code>cd Build-a-PC-Configuration-Tool
  </code></pre>
  <p>installing the requirements:</p>
  <pre><code>pip install -r requirements.txt
  </code></pre>
  <p>change directory again to go into the manage.py for migrations:</p>
  <pre><code>cd bapccanada
  </code></pre>
  <p>then migrate:</p>
  <pre><code>python manage.py make migrations
  </code></pre>
  <p>and here is the error <strong>AttributeError: module 'collections' has no attribute 'Iterator'</strong>
  <a href="https://i.stack.imgur.com/dR0Nl.png" rel="nofollow noreferrer">enter image description here</a></p>
  <p>Any ideas to solve the error? Thank you in advance!</p>