error: register_uninstall_hook

Hello. After uninstalling old version of plugin that was distributed via your website and installing and activating new one via wordpress plugin page I’ve got this error message.

Notice: register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook. Please see Debugging in WordPress for more information. (This message was added in version 3.1.0.) in /home/viewcyco/public_html/wp-includes/functions.php on line 4903
Warning: Cannot modify header information – headers already sent by (output started at /home/viewcyco/public_html/wp-includes/functions.php:4903) in /home/viewcyco/public_html/wp-includes/functions.php on line 5946
Warning: Cannot modify header information – headers already sent by (output started at /home/viewcyco/public_html/wp-includes/functions.php:4903) in /home/viewcyco/public_html/wp-admin/includes/misc.php on line 1252
Warning: Cannot modify header information – headers already sent by (output started at /home/viewcyco/public_html/wp-includes/functions.php:4903) in /home/viewcyco/public_html/wp-admin/admin-header.php on line 9

I was trying to switch themes, deactivated and uninstall other plugins and scripts but while ‘Garden Gnome Package’ is activated I’m seeing this error message.

Is there anything else I could do to solve the problem.

Regards,
Kirill M.