I'd like to install WordPress MU on my site in subdirectory.
I read instruction and did all. But computer shows me this page:
Warning: call_user_func_array() [function.call-user-func-array]: First argumented is expected to be a valid callback, '_show_post_preview' was given in /home/tuoamore/public_html/network/wp-includes/plugin.php on line 339
Warning: Cannot modify header information - headers already sent by (output started at /home/tuoamore/public_html/network/wp-includes/plugin.php:339) in /home/tuoamore/public_html/network/wp-admin/install.php on line 36
Fatal error: Call to undefined function: wp_admin_css() in /home/tuoamore/public_html/network/wp-admin/install.php on line 43
What is my mistake? Help me, please.
P.S. It's my first site. I never installed sites on hosting.