title: LXR setup, all done, but the page said "Unrecoverable error, No known root for source-tree lxr", why?
body: <p>I install LXR in my PC to build reference of Linux source code, I follow the step of LXR manual, every thing is done, but when I open my website, the page said "Unrecoverable error, No known root for source-tree lxr", could anybody help?</p>