White screen after clicking Tools -> Network

[erunafailaro]

After upgrading my WP 2.9.2 to 3.0-beta1 and adding define ('WP_ALLOW_MULTISITE', true ) ; to my wp-config.php I can see the link Network in my tools-menu.

But clicking on it causes a white screen of death.

All my plugins were disabled before clicking on the network-link.

I'm sure you'll need further information to investigate this issue. Please tell me what is missing or if you need to take a look at my server directly.

[erunafailaro]

output of phpinfo()

[dd32]

can you try adding this to your wp-config.php file and see if you've got any php errors showing?

define('WP_DEBUG', true);

[erunafailaro]

debug output

[erunafailaro]

Among a lot of notices and warnings, there is this:

Fatal error: Call to undefined method wpdb::tables() in /www/htdocs/v151372/wp-admin/network.php on line 23

Is there a file missing on my installation? Why is wpdb::tables() undefined?

[erunafailaro]

I had to deactivate the plugin DB Cache Reloaded. But that alone is not enough: I had to remove two files belonging to this plugin:

• /wp-config/db-config.ini
• /wpconfig/db.php

Now the issue is solved for me. Perhabs you should include this info in the WP-upgrade-instructions.

[nacin]

Generally speaking, db.php drop-ins may need to be updated with each release, as generally there are modifications to the wpdb class. In 3.0 in particular, we made substantial changes to wpdb to support the merge of MU.

DB Cache Reloaded entirely replaces the wpdb class, instead of extending it, so any methods we add will not be inherited by it. Hence, the tables() method did not exist. (Though, even a db drop-in that extends wpdb may not be able to function correctly in a newer version.)