如何解决“批量删除”模块的问题？

I installed "Bulk Delete" module for Drupal 7.x, and tried to bulk delete all Feed items (1575 items), but when I click Delete button, it just show page with message "Deleting 1575 nodes in 80 operations", without errors or warnings. So page just stay with this message, but not delete anything. Feed items remain in place, that's all. What is wrong?I installed "Bulk Delete" module for Drupal 7.x