Drupal：“无法创建CTools CSS缓存目录。检查文件目录的权限。“？

I am new to drupal, and am trying to help a friend with their drupal site, even though I specialize in Wordpress. i did some research on this and found results saying that by changing the permisions to 777 it would fix the issue. I did that, and it still hasn't fixed it... I'm at a total loss as I havn't changed anything yet and it was working a few weeks agoI am new to drupal, and am trying to help a fri