bbPress.org

wordpress version: 4.2.2
bbPress version: 2.5.7
Normally after activation of bbpress, I would be directed to a new page and 3 items (forums, topics, replies) would show up. The new website site I am currently working on (with X theme installed), however, doesn’t happen to do so. What happens is that right after I active the bbpress, it stays on the plugin page and says the plugin is activated. But there are no items showing up on left menu bar and also in the setting I do not find bbpress. All other plugins work well except for bbpress…