title: Getting Heroku H10 Error when trying to deploy Strapi, MongoDB Atlas
body: <p>So I've thoroughly followed the Docs for both Strapi and Heroku (with MongoDb Atlas already connected to Strapi), and I might have missed something important. When I deploy the app, the site loads for a bit then crashes. The <code>heroku logs --tail</code> command shows this:</p>
  
  <pre><code>2020-05-08T14:41:59.625984+00:00 app[web.1]: (node:23) Warning: Accessing non-existent property 'findOne' of module exports inside circular dependency
  2020-05-08T14:41:59.626067+00:00 app[web.1]: (node:23) Warning: Accessing non-existent property 'remove' of module exports inside circular dependency
  2020-05-08T14:41:59.626134+00:00 app[web.1]: (node:23) Warning: Accessing non-existent property 'updateOne' of module exports inside circular dependency
  2020-05-08T14:42:04.000000+00:00 app[api]: Build succeeded
  2020-05-08T14:42:29.627137+00:00 app[web.1]: [2020-05-08T14:42:29.626Z] debug ⛔️ Server wasn't able to start properly.
  2020-05-08T14:42:29.627879+00:00 app[web.1]: [2020-05-08T14:42:29.627Z] error Error connecting to the Mongo database. Server selection timed out after 30000 ms
  2020-05-08T14:42:29.640717+00:00 app[web.1]: npm ERR! code ELIFECYCLE
  2020-05-08T14:42:29.640989+00:00 app[web.1]: npm ERR! errno 1
  2020-05-08T14:42:29.641812+00:00 app[web.1]: npm ERR! back-end-4@0.1.0 start: `strapi start`
  2020-05-08T14:42:29.641895+00:00 app[web.1]: npm ERR! Exit status 1
  2020-05-08T14:42:29.641997+00:00 app[web.1]: npm ERR!
  2020-05-08T14:42:29.642078+00:00 app[web.1]: npm ERR! Failed at the back-end-4@0.1.0 start script.
  2020-05-08T14:42:29.642155+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  2020-05-08T14:42:29.649687+00:00 app[web.1]: 
  2020-05-08T14:42:29.649822+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
  2020-05-08T14:42:29.649879+00:00 app[web.1]: npm ERR!     /app/.npm/_logs/2020-05-08T14_42_29_643Z-debug.log
  2020-05-08T14:42:29.758124+00:00 heroku[web.1]: State changed from starting to crashed
  
  2020-05-08T14:42:30.872518+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=hidden-headland-71392.herokuapp.com request_id=2eb6e39a-875b-4b2c-91cd-3b2bdd914561 fwd="81.128.178.133" dyno= connect= service= status=503 bytes= protocol=https
  2020-05-08T14:42:31.888706+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=hidden-headland-71392.herokuapp.com request_id=d96ec78a-83ea-48ca-b576-0ad62d0a15da fwd="81.128.178.133" dyno= connect= service= status=503 bytes= protocol=https
  </code></pre>
  
  <p>My server.json files in all 3 folder, development , production and staging are as follows:</p>
  
  <pre><code>{
    "host": "${process.env.HOST || '0.0.0.0'}",
    "port": "${process.env.PORT || 1337}",
    "production": true,
    "proxy": {
      "enabled": false
    },
    "cron": {
      "enabled": false
    },
    "admin": {
      "autoOpen": false
    }
  }
  </code></pre>
  
  <p>I'm unsure about the Procfile, as it stands its a file in my base directory with no extension but with the line:</p>
  
  <pre><code> web: node strapi start
  </code></pre>
  
  <p>And for reference my <code>package.json</code> looks like this:</p>
  
  <pre><code>{
    "name": "back-end-4",
    "private": true,
    "version": "0.1.0",
    "description": "A Strapi application",
    "scripts": {
  
      "develop": "strapi develop",
      "start": "strapi start",
      "build": "strapi build",
      "strapi": "strapi"
    },
  </code></pre>
  
  <p>And my <code>database.json</code> file looks like this:</p>
  
  <pre><code>{
    "defaultConnection": "default",
    "connections": {
      "default": {
        "connector": "mongoose",
        "settings": {
          "uri": "${process.env.DATABASE_URI}",
          "database": "${process.env.DATABASE_NAME}"
        },
        "options": {
          "ssl": true
        }
      }
    }
  } 
  </code></pre>