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1. b2k
   Member
   Posted 4 years ago #

   Hi everybody, I upgraded my wordpress installation from 2.3 to 2.5 RC2 and when im going to the Administration Panel i get this error

   Fatal error: Call to undefined function wp_register_sidebar_widget() in /home/***/public_html/****/wp-admin/includes/dashboard.php on line 31

   Thanks!

2. John James Jacoby
   BuddyPress/bbPress Dev
   Posted 4 years ago #

   Reupload all files and try again?

3. b2k
   Member
   Posted 4 years ago #

   Hi,

   I did it...But the problem still.

4. harknell
   Member
   Posted 4 years ago #

   Quick question: do you have any sidebar widgets installed as Plugins? What you might be seeing is an error in one of them which is causing things to fail. There are a number of major changes in how plugins work and are activated in 2.5, and many plugins will not work properly in 2.5 unless updated, so try disabling all of you plugins and see if this clears things up. Also, try switching to the default theme.

   (if you can't actually get to the theme switching or plugin deactivation pages in the admin area, download all of your plugins and themes, then delete them all off the server except for the classic and default themes and then try to log in)

5. MemorX
   Member
   Posted 4 years ago #

   I also had this problem when upgrading to 2.5, but by accessing the themes.php file directly, I was able to revert from K2 RC 3 to the standard theme.

   That solved the problem for now. I am going to try the new RC4 of K2 to see if that helps.

   Edit:
   After the install of RC4 my style was broken, but the error was gone. After configuring a bit, the error appeared again. I discovered that this error is caused by activating the K2 "Sidebar Manager".

   So my guess is that it is sufficent to disable the manager, to get the admin-panel to work correctly.

6. jaledwith
   Member
   Posted 4 years ago #

   I think I found the solution, or at least one solution, to this problem.

   http://chaotictech.wordpress.com/2008/03/28/k2-wordpress-25-broken-i-can-fix-that/

7. workplaydream
   Member
   Posted 4 years ago #

   I updated my K2 theme to RC5, but I am still getting the dashboard error

   Fatal error: Call to undefined function: register_sidebar() … /wp-admin/includes/dashboard.php on line 31

8. workplaydream
   Member
   Posted 4 years ago #

   -

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