确保临时目录存在！检查管理/文件系统的设置。特别是如果数据库是从另一个系统（即Windows）复制的，可能设置错误。

Make sure that the temp directory exists! Check Admin/File System for the setting. Especially if the DB was copied from another system (i.e. Windows), this may be set wrong.

如果临时目录不存在，则无法编译将其复制到默认的/ files / ...目录下的CSS文件

If the temp directory doesn't exist, it can't compile the CSS files before copying them to the default/files/... directory