AdSense Still not Working

Yup, I'm still having trouble to put Google AdSense in this blog. Okay, I know I can only put AdSense for search, but still, when I tried to generate the code, it will always return error. Saying "404 Not Found" followed by ugly string like this:

The requested URL %2Fadsense%2Fcse-code%3FadSlotChannel.id%3D45112097 was not found on this server.

I don't know what's happen. Tried to google it, but still no luck.

Does anybody knows how to solve this problem?