[Plugin: Yet Another Related Posts Plugin] Plugin related error – can’t disable any plugin. Locked o

Out of the blue i started getting:

[03-Apr-2009 12:57:34] PHP Warning:  require_once(includes.php) [<a href='function.require-once'>function.require-once</a>]: failed to open stream: No such file or directory in /home3/rxscene/public_html/wp-content/plugins/yet-another-related-posts-plugin/yarpp.php on line 11

[03-Apr-2009 12:57:34] PHP Fatal error:  require_once() [<a href='function.require'>function.require</a>]: Failed opening required 'includes.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home3/rxscene/public_html/wp-content/plugins/yet-another-related-posts-plugin/yarpp.php on line 11

Renaming the plugin directory just gives another error

[03-Apr-2009 22:07:23] PHP Fatal error:  require_once() [<a href='function.require'>function.require</a>]: Failed opening required 'includes.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home3/rxscene/public_html/wp-content/plugins/yet-another-related-posts-plugin/yarpp.php on line 11

[03-Apr-2009 22:07:55] PHP Warning:  require_once(/home3/rxscene/public_html/wp-content/plugins/db-cache/db-functions.php) [<a href='function.require-once'>function.require-once</a>]: failed to open stream: No such file or directory in /home3/rxscene/public_html/wp-content/db.php on line 598

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I don’t think this plugin caused this however, but why the sudden change? i checked the plugin directory, all files intact, i didn’t touch a thing.