Sounds like the plugin does not have a valid header.
Can you post the plugin here, in a code block, or send a link to where it can be downloaded? What plugin are we talking about?
I have the same problem. My website is completely new with no design yet. http://www.latestartermusician.com/Blog/
I am using wordpress 2.8.4 and I downloaded the zip file bbpress1.0.2.zip.
Thank you,
Please note that bbPress is not a plugin.
It is a standalone forum software.
Yep, figured that out after reading the directions more closely, but unfortunately ran into another error. There was a configuration problem and when I tried to visit the intended URL, it gave me a 500 Internal Server Error. My host says it could a configuration problem, but they are going to check to see if it’s on their end first. If not…
Ohhh, for the first post, toddmccalla, you were installing bbPress as a WordPress plugin, that was the problem. bbPress is not a WordPress plugin.
https://bbpress.org/forums/topic/header-invalid#post-60960