[Drupal] "Boost: Crawler is already running. Attempt to start crawler failed"

Boost 是 Drupal 中增進效能的強大模組，設定玩著玩著後若手動Cron的話會看到一個訊息

"Boost: Crawler is already running. Attempt to start crawler failed"

查過一些文章顯示為設定的timeout太短之類的，後來我發現把那一項設定reset後再enable就好了。
傑克，這真是太神奇了!