Errors after moving site

I moved my site into a subfolder but started getting Super Cache error messages so I uninstalled it and tried installing it again. When I activated it I got these error messages:

Warning: include() [function.include]: Failed opening ‘<mysitepath>/public_html/wp-content/plugins/wp-super-cache/wp-cache-base.php’ for inclusion (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in <mysitepath>/public_html/site/wp-content/plugins/wp-super-cache/wp-cache.php on line 53

Warning: include_once(<mysitepath>/public_html/wp-content/plugins/wp-super-cache/ossdl-cdn.php) [function.include-once]: failed to open stream: No such file or directory in <mysitepath>/public_html/site/wp-content/plugins/wp-super-cache/wp-cache.php on line 70

Warning: include_once() [function.include]: Failed opening ‘<mysitepath>/public_html/wp-content/plugins/wp-super-cache/ossdl-cdn.php’ for inclusion (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in <mysitepath>/public_html/site/wp-content/plugins/wp-super-cache/wp-cache.php on line 70

Warning: Cannot modify header information – headers already sent by (output started at <mysitepath>/public_html/site/wp-content/plugins/wp-super-cache/wp-cache.php:53) in <mysitepath>/public_html/site/wp-content/plugins/si-contact-form/wp-session/class-wp-session.php on line 92

Later down the page there was also this (surrounded by red):

Warning! WP Super Cache caching broken! The script advanced-cache.php could not load wp-cache-phase1.php.

Please edit /<mysitepath>/public_html/site/wp-content/advanced-cache.php and make sure the path to /<mysitepath>/public_html/wp-content/plugins/wp-super-cache/wp-cache-phase1.php is correct.

And then this, surrounded by yellow:

The plugin generated 1380 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

I’m not a WP guru, does anyone know what any of this means? Right now it’s deactivated, does anyone know how I can get Super Cache up and running again error-free?

FWIW the web site is cheribarner.com, but not sure if that’s any help since the plugin is deactivated.

Thanks!

http://wordpress.org/extend/plugins/wp-super-cache/