Error 502 - Bad Gateway on Node app

javascript
nodejs
#1

I am running a Node app and since yesterday it stopped working. It just hangs for around 2 minutes and in the end I get this:

<html>
  <head>
    <meta charset='utf-8'> 
    <title>Error 502 - Bad Gateway</title>
    <link rel="stylesheet" type="text/css" href="https://cdn.c9.io/errors/style.css" />
    <style type="text/css">
    .error_content {
        background: rgba(255, 255, 255, 0.23);
        padding: 10px;
        width: 641px;
        margin: 25px 0;
        display: none;
    }
    
    #error-msg {
        display: block;
    }
    </style>
  </head>
  <body class="errorUnknown light">
    <div id="wrapper">
      <h1>Error 502 - Bad Gateway</h1>
      <div class="error_content" id="error-msg">
          <p>Please click <a href="javascript:location.reload(true)">here</a> to try again, if the issue persists please contact <a href="https://c9.io/support">support</a></p>
      </div>
      
      <a href="http://status.c9.io">Status Page</a> |
      <a href="https://c9.io/support">Support</a> |
      <a href="https://c9.io/dashboard.html">Dashboard</a> |
      <a href="https://c9.io">Home</a>
    </div>
  </body>
</html>

Really need help with this. Thanks!