Messed up page - cache folder isn't writable

Possible error messages
  • Warning: mkdir() [function.mkdir]: Permission denied in .../wp-content/plugins/smart-slider-3/nextend/library/libraries/filesystem/filesystem.php
  • Warning: file_put_contents(.../wp-content/cache/nextend/web/nextend-frontend/nextend-frontend.css.manifest) [function.file-put-contents]: failed to open stream: No such file or directory in .../wp-content/plugins/smart-slider-3/nextend/library/libraries/filesystem/filesystem.php
  • Warning: filemtime() [function.filemtime]: stat failed for .../wp-content/cache/nextend/web/nextend-frontend/nextend-frontend.css in .../wp-content/plugins/smart-slider-3/nextend/library/libraries/assets/css/assets.php
Solution

These messages can appear, when the cache folder isn't writable, so you should change it's permissions, as you can read here: