cannot login to my wp-admin

[eezeee]

My site http://wizardspost.com/ is WORKING but a strange problem has appeared.
I was UPGRADING (auto upgrade)to wordpress latest version 3.0.1 from 3.0 I think..when it stalled ( I think)
On refreshing it gave the following messages:


Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, '__return_zero' was given in /home/wizard/public_html/wordpress/wp-includes/plugin.php on line 166


Fatal error: Call to undefined function is_multisite() in /home/wizard/public_html/wordpress/wp-login.php on line 85


Now I cannot login to my wp-admin.
Can anyone suggest what I should do.

You could log in to http://wizardspost.com/wordpress/wp-login and check it out.

 

[Anna]

Hello,

Sounds like the upgrade failed.
You could try getting fresh files from wordpress and uploading, in case there's some file that got corrupted, or is missing from when the upgrade stalled.

 

[eezeee]

I downloaded wordpress 3.0.1 and installed it.

Good result - The page loads and I can also login to http://wizardspost.com/wordpress/wp-admin/ AND see my dashboard. All the links seem to work properly EXCEPT PLUGINS.

Bad Result - When I click on Plugins on the dashboard I get this error :

Not Found

The requested URL /wordpress/wp-admin/plugins.php was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an Error Document to handle the request.

On checking the files I note that plugins.php is in wp-admin > includes and another one in wp-includes

Any suggestions what I should do? Incidentally, I had only ONE plugin active ( adsense-delux.php)
SAME result when I rename wp-content/plugins folder

 

[Jarryd]

Hello, can you try manually replacing the missing files?