Nicolas Cuny

Same issue, had to revert to 3.1.32.

Compatibility issue with plugin mailjet-for-wordpress v5.2.4.

Hello,

I had the exact same symptom with some theme I bought. What happened is that when I added a second language after installing Polylang I would get the fatal error.

The error happened because the static front page provided by the theme had no translation yet.

To solve this I switched to another theme, added a translation to the front page, and then reverted to the theme I wanted to use.

Let me know if you want more details.

Sure. This is what I did :

1. log into hosting (FTP or SSH)
2. go to wp-content/plugins
3. rename wp-super-cache folder to wp-super-cache.old
4. log into WP Admin
5. (you should then receive a warning that plugin WP Super Cache could not be found and has been deactivated)
6. just go to Plugins > Add new in the sidebar
7. search for WP Super Cache and install it again from the repository
8. that’s it !

Please note that I only renamed the wp-super-cache folder because I knew for sure from analyzing log files that that’s where the problem came from. Otherwise you can rename the whole plugins folder.

Updating WP Super Cache to 1.5.1 solved the problem for me, even without updating WordPress.

• This reply was modified 7 years, 8 months ago by Nicolas Cuny.

I got the same error on my WordPress 4.5.9 install. I just renamed the plugin folder until I can update WP.

I reactivated the plugin successfully after 4.7.4 update. No more problem. Thanks.

Same problem here, but with WP 4.6.1.

I deleted the plugin and reinstalled it, but it could not be activated. I then replaced meow_admin.php from the above link, still could not be activated :
Fatal error: Can't use function return value in write context in /home/scintell/scintellefr_prod/wp-content/plugins/wp-retina-2x/common/meow_admin.php on line 119

You have to disable “Force current permalinks” in the plugin options.

Solution was found here.