Hi, I just do manual upgrading from WP 3.1.1 to 3.1.3. It was successful. The problem is when i want to add new plugin (regenerate thumbnails) through my wp-admin, and want to activated, it stated
the plugin does not have a valid header. And the worst thing is all of my plugin I have installed before is disappeared in the dasboard menu, but when I look into the FTP, the file are still there.
I have googled and also read some tips in this forum but none of them worked for me.
- put the file into the directory plugin. For example, I put the file regenerate-thumbnails.php into public_html/wp-content/plugins so it become public_html/wp-content/plugins/regenerate-thumbnails.php
- change the Tested up to: 3.1 in the readme.txt file of the plugin
All of my effort seems useless
I have been hopeless, I deleted all the plugin and re-installed back but the plugin menu in the dashboard still empty and everytime i want to activate it, there is a noisy message
the plugin does not have a valid header
Please anyone help me