I have the same error on trying to update to WP3.3
Fatal error: Cannot redeclare class Plugin_Upgrader in…/wp-admin/includes/class-wp-upgrader.php on line 593
I’m sure too there is a simple solution but what?
All my plugins are updated but I suspect it may be an issue with a plugin.
So look forward to help here….
OK-After somewhile I solved my problem with this error:
Fatal error: Cannot redeclare class Plugin_Upgrader in…/wp-admin/includes/class-wp-upgrader.php on line 593
It was due to some plugin problem-but what? I have about 60 plugins on my WP multisite (way to many!).
To fix the error I deactivated all plugins and then updated to WP3.3 (after backup of course!?). The update then worked! Then I reactivated all plugins & so WP3.3 is now installed. All good. Hope this helps previous poster & anyone else with this issue/error…
Hi
Thanks for your input and glad to hear you managed to resolve your problem. For me that won’t work, because I am still building my site in a sub-directory and as such have NO plug-ins at all on my site!
Can anyone else help?
Thanks,
B
I can’t even login into my site to deactivate plugins! I keep getting this error too after the upgrade to 3.3. HELP!!
Fatal error: Call to undefined function is_rtl() in /home/minx/public_html/wp-includes/general-template.php on line 2102
Mine says this (see above)
Hi,
I just logged into my dashboard and noticed that there’s a new version of my current theme to upgrade. I wouldn’t mind betting that once I upgrade that, the WP theme will upgrade okay.
I’ll do it this evening and report back!
B.
Hi again,
Yes, just as predicted. My problem was related to the requirement of a new Theme update before updating WP. I updated the theme and then WP updated fine.
Hope you resolve your issue as simply as that.
B
