在drupal7.0安裝Views失敗

在drupal7.0安裝Views7.x-3.0-alpha1，出現這樣的訊息

* The specified file temporary://fileid7WqK could not be copied, because the destination directory is not properly configured. This may be caused by a problem with file or directory permissions. More information is available in the system log.
* http://ftp.drupal.org/files/projects/views-7.x-3.0-alpha1.tar.gz 無法被存在 temporary://update-cache/views-7.x-3.0-alpha1.tar.gz。
* 無法從 http://ftp.drupal.org/files/projects/views-7.x-3.0-alpha1.tar.gz 取得 Drupal。

請問我該怎麼處理這問題呢？