Fatal error: Uncaught Zend_Cache_Exception: cache_dir "/home/testing/promotoner/var/cache/" is not writable in /home/testing/promotoner/vendor/magento/zendframework1/library/Zend/Cache.php:209
Stack trace:
#0 /home/testing/promotoner/vendor/magento/zendframework1/library/Zend/Cache/Backend/File.php(180): Zend_Cache::throwException()
#1 /home/testing/promotoner/vendor/colinmollenhour/cache-backend-file/File.php(86): Zend_Cache_Backend_File->setCacheDir()
#2 /home/testing/promotoner/vendor/magento/zendframework1/library/Zend/Cache.php(153): Cm_Cache_Backend_File->__construct()
#3 /home/testing/promotoner/vendor/magento/zendframework1/library/Zend/Cache.php(94): Zend_Cache::_makeBackend()
#4 /home/testing/promotoner/vendor/magento/framework/App/Cache/Frontend/Factory.php(156): Zend_Cache::factory()
#5 /home/testing/promotoner/vendor/magento/framework/Cache/Frontend/Adapter/Zend.php(38): Magento\Framework\App\Cache\Frontend\Factory->Magento\Framework\App\Cache\Frontend\{closure}()
#6 /home/testing/promotoner/vendor/magento/fr in /home/testing/promotoner/vendor/magento/zendframework1/library/Zend/Cache.php on line 209