when going to manage => clean options and click the button to start the plugin, I get these warnings on top of the page, then the plugin seems to work fine.
Warning: fopen(..//wp-content/cache/f20a0b3847983197b4e0c17532537c22/category_relationships/bea85e5b3109c267e9e558fc1b19a431.php) [function.fopen]: failed to open stream: No such file or directory in /var/www/web6/web/wordpress/wp-content/plugins/clean-options/cleanoptions.php on line 227 Warning: fopen(..//wp-content/cache/f20a0b3847983197b4e0c17532537c22/category_relationships/a202eb41473f7026bbc4e420072d7eb7.php) [function.fopen]: failed to open stream: No such file or directory in /var/www/web6/web/wordpress/wp-content/plugins/clean-options/cleanoptions.php on line 227 WARNING !! ERROR MESSAGE !! There is an autoload yes Option with No Name with the value: WARNING !! ERROR MESSAGE !! Could not open file ..//wp-content/cache/f20a0b3847983197b4e0c17532537c22/category_relationships/bea85e5b3109c267e9e558fc1b19a431.php Could not open file ..//wp-content/cache/f20a0b3847983197b4e0c17532537c22/category_relationships/a202eb41473f7026bbc4e420072d7eb7.php The following Options appear to be orphans. Non-selectable Options are known to have been created from files present during upgrade or backup, or are legitimate options that do not "fit" the search for get_option or get_settings. If you wish to remove them by other means, do so at your own risk.
any hints what could cause these problems?