Title: PHP errors Wp-admin and Wp-includes on upgrade
Last modified: August 18, 2016

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# PHP errors Wp-admin and Wp-includes on upgrade

 *  [alvinyap](https://wordpress.org/support/users/alvinyap/)
 * (@alvinyap)
 * [20 years, 5 months ago](https://wordpress.org/support/topic/php-errors-wp-admin-and-wp-includes-on-upgrade/)
 * Hi all, I’ve been using WP since September and just a couple of hours ago, I 
   upgraded from 1.5 to 2.0 – now I’ve got this error when I try to view my blog:
 * Fatal error: Call to undefined function: is_user_logged_in() in /home/alvinyvo/
   public_html/wp-includes/classes.php on line 1566
 * When I try to log in, I get this error:
 * Warning: main(/home/alvinyvo/public_html/wp-includes/registration-functions.php):
   failed to open stream: No such file or directory in /home/alvinyvo/public_html/
   wp-admin/admin.php on line 12
 * Fatal error: main(): Failed opening required ‘/home/alvinyvo/public_html/wp-includes/
   registration-functions.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’)
   in /home/alvinyvo/public_html/wp-admin/admin.php on line 12
 * 1. I didn’t erase the old WP files, I just overwrote them
    2. I didn’t back up
   my index.php – I didn’t back up anything, just overwrote them 3. I am using Tiger-
   plugin for the interface
 * Should I delete Wp-admin and Wp-includes folders and just upload again and should
   it be binary or ASCII?
 * Could anyone please help me to work around this? I’m tempted to re-install but
   use my old Database (can I do that?) but I don’t want to make it worse than it
   is.
 * Thanks

Viewing 4 replies - 1 through 4 (of 4 total)

 *  [citeewurkor](https://wordpress.org/support/users/citeewurkor/)
 * (@citeewurkor)
 * [20 years, 5 months ago](https://wordpress.org/support/topic/php-errors-wp-admin-and-wp-includes-on-upgrade/#post-310296)
 * Man, I hate to say this, but did you read any of this?
    [http://wordpress.org/support/topic/53208?replies=103](http://wordpress.org/support/topic/53208?replies=103)
 * Did you run the upgrade script?
 *  [moshu](https://wordpress.org/support/users/moshu/)
 * (@moshu)
 * [20 years, 5 months ago](https://wordpress.org/support/topic/php-errors-wp-admin-and-wp-includes-on-upgrade/#post-310297)
 * [http://wordpress.org/support/topic/54578?replies=1](http://wordpress.org/support/topic/54578?replies=1)
   
   Double posting is considered bad manners 🙂
 * 1. That’s a mistake, you can still do it.
    2. Too late, I guess. 3. All the plugins
   are supposed to be deactivated before upgrade.
 * All the WP files should be uploaded as ASCII.
 * And the bonus response: on the main page of this forum there is a “sticky” post
   with red background. Read it!
 *  [mattman](https://wordpress.org/support/users/mattman/)
 * (@mattman)
 * [20 years, 5 months ago](https://wordpress.org/support/topic/php-errors-wp-admin-and-wp-includes-on-upgrade/#post-310298)
 * Hum,
 * That’s unusual…Sorry I can’t help more than that. I can point out though, make
   sure that you get the latest WP-Tiger admin interface plugin. The old one has
   conflicts – new admin features and all.
 *  Thread Starter [alvinyap](https://wordpress.org/support/users/alvinyap/)
 * (@alvinyap)
 * [20 years, 5 months ago](https://wordpress.org/support/topic/php-errors-wp-admin-and-wp-includes-on-upgrade/#post-310518)
 * Sorry for the double post and I guess I got caught by RFTM this time

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘PHP errors Wp-admin and Wp-includes on upgrade’ is closed to new replies.

## Tags

 * [upgrade](https://wordpress.org/support/topic-tag/upgrade/)
 * [wp2.0](https://wordpress.org/support/topic-tag/wp2-0/)

 * In: [Installing WordPress](https://wordpress.org/support/forum/installation/)
 * 4 replies
 * 4 participants
 * Last reply from: [alvinyap](https://wordpress.org/support/users/alvinyap/)
 * Last activity: [20 years, 5 months ago](https://wordpress.org/support/topic/php-errors-wp-admin-and-wp-includes-on-upgrade/#post-310518)
 * Status: not resolved

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