When I upgrade Moodle 2.9 to 3.0.3, the site is normal. But the "Edit settings" page of every course can't load completely. The page in English is normal. But the page in other languages(I used Chinese/Japanese/Finnish etc.) is abnormal.
I have upgraded my moodle to 3.0.4 today. The pages (error in version 3.0.3) display normally.