error when actiavate this plugin

I am getting the same message : –

Warning: Cannot modify header information – headers already sent by (output started at /home/hugowell/public_html/wp-admin/includes/template.php:1642) in /home/hugowell/public_html/wp-includes/pluggable.php on line 876

Clicked on Dash Board and it went OK, and can access the material, but is their an underlying issue?

Thanks

Hello, I am receiving this same error message. I’m using:

wp version 3.5.1
seo plugin version 1.3.4.4

I’m currently using the Zenon Lite Theme.

Error Message:

Warning: Cannot modify header information – headers already sent by (output started at D:\Hosting\2930673\html\wordpress\wp-includes\script-loader.php:710) inD:\Hosting\2930673\html\wordpress\wp-includes\pluggable.php on line 876

The plugin still installs and seems fine, but when I go to edit a page, the drop down window is unresponsive, it will not expand to offer the programing options.

@rlculver & @nobodymove: As per the Forum Welcome, please post your own topic. Posting in an existing topic prevents us from being able to track issues by topic. Added to which, your problem – despite any similarity in symptoms – is likely to be completely different.

any solution ?
i think me and rlculver is having same problem …… just click any button the message will be disappear but worry there any other hidden issue …
thanks