Warning: Missing argument 1 for register_activation_hook

Hello,

I am new to WordPress and it seems that I have gotten myself into a little bit of trouble with your plugin. When I logged into my site today I got the following message across the top of the screen.

Warning: Missing argument 1 for register_activation_hook(), called in /home/content/16/9280416/html/NICKWES/wp-content/plugins/simple-picture-menu/index.php on line 29 and defined in /home/content/16/9280416/html/NICKWES/wp-includes/plugin.php on line 643

Warning: Missing argument 2 for register_activation_hook(), called in /home/content/16/9280416/html/NICKWES/wp-content/plugins/simple-picture-menu/index.php on line 29 and defined in /home/content/16/9280416/html/NICKWES/wp-includes/plugin.php on line 643

Warning: Missing argument 1 for register_deactivation_hook(), called in /home/content/16/9280416/html/NICKWES/wp-content/plugins/simple-picture-menu/index.php on line 30 and defined in /home/content/16/9280416/html/NICKWES/wp-includes/plugin.php on line 668

Warning: Missing argument 2 for register_deactivation_hook(), called in /home/content/16/9280416/html/NICKWES/wp-content/plugins/simple-picture-menu/index.php on line 30 and defined in /home/content/16/9280416/html/NICKWES/wp-includes/plugin.php on line 668

Warning: Missing argument 1 for register_uninstall_hook(), called in /home/content/16/9280416/html/NICKWES/wp-content/plugins/simple-picture-menu/index.php on line 31 and defined in /home/content/16/9280416/html/NICKWES/wp-includes/plugin.php on line 698

Warning: Missing argument 2 for register_uninstall_hook(), called in /home/content/16/9280416/html/NICKWES/wp-content/plugins/simple-picture-menu/index.php on line 31 and defined in /home/content/16/9280416/html/NICKWES/wp-includes/plugin.php on line 698

Warning: Cannot modify header information – headers already sent by (output started at /home/content/16/9280416/html/NICKWES/wp-includes/plugin.php:643) in /home/content/16/9280416/html/NICKWES/wp-includes/pluggable.php on line 899

I was hoping that I could just deactivate the plugin but now I am no longer able to log in to my site. I’m getting this message now.

Not Found

The requested URL /NICKWES/admin was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
Apache Server at http://www.nickwes.com Port 80

Please help.

http://wordpress.org/plugins/simple-picture-menu/