關於fopen() [function.fopen] 的問題

我在網上空間安裝完drupal之後
出現了以下message

請問各位大大應該要怎樣解決呢=(?

# warning: fopen() [function.fopen]: SAFE MODE Restriction in effect. The script whose uid is 10139 is not allowed to access /tmp/filemuwaUI owned by uid 48 in /var/www/vhosts/slashleung.com/httpdocs/includes/file.inc on line 764.
# warning: fopen(/tmp/filemuwaUI) [function.fopen]: failed to open stream: Success in /var/www/vhosts/slashleung.com/httpdocs/includes/file.inc on line 764.
# 無法產生檔案。