Can't login to admin

[kenni]

Hi everyone,
I've been having problems logging in to the getsimple (3.0) admin. I've worked out that it's due to some plugins that I've installed - p01-contact and thephotogallery. What's happening is that when I try to log in the page just refreshes and I'm still logged out. I've turned on debug mode and get the follow errors...

Notice: Trying to get property of non-object in /home/folder/public_html/plugins/p01-contact_gs.php on line 69

Warning: Cannot modify header information - headers already sent by (output started at /home/thecocoa/public_html/plugins/p01-contact_gs.php:69) in /home/folder/public_html/admin/inc/cookie_functions.php on line 30

Warning: Cannot modify header information - headers already sent by (output started at /home/thecocoa/public_html/plugins/p01-contact_gs.php:69) in /home/folder/public_html/admin/inc/login_functions.php on line 81
Error: Headers already sent in /home/folder/public_html/plugins/p01-contact_gs.php on line 69 If your browser does not redirect you, click here

Once I remove the p01-contact and thephotogallery plugins I can log in again. Does anyone have a solution to this as yet?

Thanks in advance,
Kim

Kim, thank you!

This issue was annoying the living bejesus out of me. Even on fresh installs I got this problem. I'm working on a new plugin, and every time my session ran out, this happened.

Removing all empty spaces and lines immediately after the plugins end-PHP tag ?> solved this problem right away.