Wordpress Admin not working

[critter]

Several features in my Wordpress Admin page are not work. The plugin and themes sections are not work; instead, I get the following error when I click on those features.
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache/1.3.41 Server at datatechart.org Port 80

Not sure what to do of where to start. Any ideas?
Thanks,
Tim

[joemuller]

Tim,

I've made a quick couple changes to your .htaccess file that should fix things. Please let me know if you still are having issues with reaching the admin page. I've saved a copy of the old file just in case you need it.

-- Joe

[critter]

Hi Joe,
Thanks for making the change, that help somewhat. I could access the plugin and update page.
But when I updated WordPress, not I get this error.
Fatal error: Call to undefined function wp_get_current_user() in /nfs/www/WWW_pages/critter/datatechart.org/wp-includes/capabilities.php on line 1342.
Now both the public site http://www.datatechart.org and the admin pages don't work.
Tim

[cdkeen]

Hello Tim,
I found a link with some information that seems relevant to your problem:
http://wordpress.org/support/topic/fata ... ent_user-4

Also you have 2 wp-includes directories (one nested within the other) in your dataechart.org root folder:
./wp-includes/wp-includes/capabilities.php
./wp-includes/capabilities.php
and therefore you have 2 capabilities.php files. It is advisable to resolve that issue firstly and then proceed on to the coding error(s). You could either manually compare and combine files or download and manually replace the wp-includes folder with one from a fresh wp install. Please let me know if you end up needing additional assistance, thanks for choosing Sonic.net!

[critter]

Hi,
What were the changes that you made to the .htaccess file?

[cdkeen]

Hi,
What were the changes that you made to the .htaccess file?

Joe added these lines to the top of your .htaccess file:

Action php-cgi /cgi-bin/php53
AddHandler php-cgi .php