Warning: Cannot modify header information – headers already sent by (output star

Dear all gurus,

I have installed the latest version of WP, after my installation, i can’t even load my login page.

Below is the error msg:

Warning: Cannot modify header information – headers already sent by (output started at C:\inetpub\vhosts\…………..\seo\wp-content\plugins\tubepress\classes\net\php\pear\HTTP\Request2\Adapter.class.php:297) in C:\inetpub\vhosts\………\seo\wp-includes\pluggable.php on line 897

How can i solve this? Need your advice.

Thanks in advance.