title: MIT APPInventor error on openning. How to fix it?
body: <p>I installed MIT AppInventor successfully, but when I tried to open it on this address <code>localhost:8004/</code><br>
   It shows an error like this: <code>Sorry, the requested URL 'http://127.0.0.1:8004/' caused an error: Not Found: '/'</code>  </p>
  
  <p>Here's the aiStarter lookslike when I visit the url:<br>
   <a href="https://i.stack.imgur.com/aUlpS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aUlpS.png" alt="aiStarter after visiting the address"></a></p>
  
  <p>I am running a 64bit version of windows. And the appinvertor installed on Program Files(x86). How to fix this error? Thanks!</p>