Once when installing WordPress MU, after submitting the form in the setup wizard, I got the following error:
Fatal error: Call to undefined function: wp_die()
I did extensive research a la Google, and lots of other people seemed to have the problem [1, 2, 3], but I still couldn’t find the answer.
I finally figured it out: the database user I had added wasn’t setup with permissions to access the database. Apparently there’s a bug in WordPress MU that chokes on this instead of displaying an explanatory error message.
If that trick doesn’t work, I’d suggest double-checking your database information. In particular, if you’re in a shared hosting environment, you’ll probably have to prefix the database name/user with some form of your hosting username (e.g. “username_database” instead of just “database”).
Hope this helps someone!
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Thanks so much – I was installing MU to play with it for some affiliate sites I’m putting together and that was very frustrating. I just transposed two characters in my DB username.
Cheers~