Cannot uninstall WP-SuperCache

I tried wp-supercache and decided to uninstall it. I first deactivated the plugin. When I tried to delete the plugin, I got the warnings below. Is it my fault, the plugin’s fault or WP’s fault?

Thanks!

Warning: include(../../../wp-load.php) [function.include]: failed to open stream: No such file or directory in /srv/www/******.com/public_html/blog/wp-content/plugins/wp-super-cache/uninstall.php on line 8

Warning: include() [function.include]: Failed opening ‘../../../wp-load.php’ for inclusion (include_path=’.:/usr/share/php:/usr/share/pear’) in /srv/www/******.com/public_html/blog/wp-content/plugins/wp-super-cache/uninstall.php on line 8

UNINSTALL_WPSUPERCACHE must be set to a non-blank value in uninstall.php