title: production.ERROR: RuntimeException: No supported encrypter found. The cipher and / or key length are invalid.
body: <p>I run my laravel 5.2  app on nginx ubuntu xenial (digital ocean) </p>
  
  <p>Image don't upload in my production app whereas at localhost it works fine.</p>
  
  <p>In my laravel log following error is shown :</p>
  
  <pre><code>&gt;     production.ERROR: RuntimeException: No supported encrypter found. The cipher and / or key length are invalid.in
  &gt; /var/www/laravel/bootstrap/cache/compiled.php:7771 Stack trace:
  &gt; #0 /var/www/laravel/bootstrap/cache/compiled.php(7761): Illuminate\Encryption\EncryptionServiceProvider-&gt;getEncrypterForKeyAndCipher(NULL,
  &gt; 'AES-256-CBC')
  </code></pre>
  
  <p>ans so on ..</p>
  
  <p>How do i resolve it.</p>