title: The temporary folder is not writable for CKFinder
body: <p>Ckfinder 3.4.1, following error from samples: </p>
  
  <pre><code> Fatal error: Uncaught exception 'CKSource\CKFinder\Exception\InvalidConfigException' with message 'The temporary folder is not writable for CKFinder' in /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/cksource/ckfinder/src/CKSource/CKFinder/Config.php:330 Stack trace: #0 /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/cksource/ckfinder/src/CKSource/CKFinder/Config.php(73): CKSource\CKFinder\Config-&gt;validate() #1 /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/cksource/ckfinder/src/CKSource/CKFinder/CKFinder.php(91): [error] 30729#0: *100469095 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught exception 'CKSource\CKFinder\Exception\InvalidConfigException' with message 'The temporary folder is not writable for CKFinder' in /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/cksource/ckfinder/src/CKSource/CKFinder/Config.php:330
  Stack trace:
  #0 /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/cksource/ckfinder/src/CKSource/CKFinder/Config.php(73): CKSource\CKFinder\Config-&gt;validate()
  #1 /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/cksource/ckfinder/src/CKSource/CKFinder/CKFinder.php(91): CKSource\CKFinder\Config-&gt;__construct('/home/stroylocm...')
  #2 /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/pimple/pimple/src/Pimple/Container.php(113): CKSource\CKFinder\CKFinder-&gt;CKSource\CKFinder\{closure}(Object(CKSource\CKFinder\CKFinder))
  #3 /home/stroylocman/www/htdocs/ckfinder/core/connector/php/vendor/cksource/ckfinder/src/CKSource/CKFinder/CKFinder.php(185): Pimple\Container-&gt;offsetGet('config')
  </code></pre>
  
  <p>Temporary folder from:</p>
  
  <p>$config['tempDirectory'] = sys_get_temp_dir();</p>
  
  <p>is</p>
  
  <p>/tmp/stroylocman</p>
  
  <p>and this folder has 777 permission.</p>
  
  <p>But scripts from samples does not work. What is wrong?
  Thx</p>