Is this a Bug ??

This what I currently see on my domain

"Warning: /home/rralhnax/public_html/app/tmp/cache/ is not writable in/home/rralhnax/public_html/lib/Cake/Cache/Engine/FileEngine.phpon line389

Fatal error: Uncaught CacheException: Cache engine "default" is not properly configured. Ensure required extensions are installed, and credentials/permissions are correct in /home/rralhnax/public_html/lib/Cake/Cache/Cache.php:186 Stack trace: #0 /home/rralhnax/public_html/lib/Cake/Cache/Cache.php(151): Cache::_buildEngine('default') #1 /home/rralhnax/public_html/app/Lib/MooCache.php(70): Cache::config('default', Array) #2 /home/rralhnax/public_html/app/Config/core.php(345): MooCache->setCache('default') #3 /home/rralhnax/public_html/lib/Cake/Core/Configure.php(72): include('/home/rralhnax/...') #4 /home/rralhnax/public_html/lib/Cake/bootstrap.php(432): Configure::bootstrap(true) #5 /home/rralhnax/public_html/app/webroot/index.php(70): include('/home/rralhnax/...') #6 {main} thrown in/home/rralhnax/public_html/lib/Cake/Cache/Cache.phpon line186"