The plugin does not have a valid header.

Probably would help to specify:

(a) the plugin name and version
(b) what version of WordPress you’re using
(c) any other pertinent information about your WordPress environment – OS, PHP version, web server…

For what its worth, a simple Google on your subject title throws up quite a few articles on the issue (not necessarily solutions). Probably stating the obvious here – but have you looked at the header of the plugin in question – and is it actually valid?

Hi ballinascreen,

I have the same problem if you can help please, details are
Wordpress 2.9

plugin details:

<?php
/*****
Plugin Name: RAP Bank
Plugin URI: https://rapbank.com
Description: [rapbank] shortcode for in-post and sidebar product listings
Author: rapbank.com
Version: 1.1
Author URI: https://rapbank.com
*****/

require_once( ‘rapbank-core.php’ );

?>

Has anyone found a solution to this problem, because I am having the same problem, only after I did an automatic update? Any help would be greatly appreciated.

I too am facing this problem:

/*
Plugin Name: Rooh.It Highlighter, AutoPublisher, and AutoTweeter
Plugin URI: https://roohit.com/site/wpPlugins.php
Description: Add a Highlighter: Saves, Shares, Cites, Distributes, Posts, Publishes & Generates links to your site.
Version: 6.0.1
Author: Rooh.It
Author URI: https://roohit.com
*/

WordPress 3.0.1

I saw one suggested work-around, don’t know yet if it works. FYI.

https://rooh.it/b2f75

Thanks but I managed to fix it ??

Looks like this error is very common, but the mistake I was doing is funny. I was installing a theme in plugins. ??

The plugin (oh sorry the Theme) is installed here
Mortgage refinancing rates

It happens due to duplicate copy of a folder inside a folder. It happens when you unzip a folder. like /wordpress/wordpress/…

make sure that you keep on level only.
Thanks
Anil
Mortgage calculator with taxes and insurance and pmi