OK…
Even if I’ve solve the 500 Error, there’s now another error: WP Super Cache not working!
When I try to test the plugin, this say: “The pages do not match! Timestamps differ or were not found!” So, I’ve start the log system, and I’ve see this error: “No closing html tag. Not caching.” But all the html tag are closed! If I try to test the plugin with all the plugins deactivated, the results is the same!
I’m going crazy! >.<