when running mobilepress some time issues arise

When running the plugin, after loggin out, I cannot login again. Errors:

Warning: session_start() [function.session-start]: open(/data/session/3/a/sess_3af7e7018063c65e145815aed385d7b8, O_RDWR) failed: Permission denied (13) in /data/members/paid/m/a/maxx-online.nl/htdocs/www/wordpress/wp-content/plugins/mobilepress/mobilepress.php on line 26

Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at /data/members/paid/m/a/maxx-online.nl/htdocs/www/wordpress/wp-content/plugins/mobilepress/mobilepress.php:26) in /data/members/paid/m/a/maxx-online.nl/htdocs/www/wordpress/wp-content/plugins/mobilepress/mobilepress.php on line 26

Warning: Cannot modify header information – headers already sent by (output started at /data/members/paid/m/a/maxx-online.nl/htdocs/www/wordpress/wp-content/plugins/mobilepress/mobilepress.php:26) in /data/members/paid/m/a/maxx-online.nl/htdocs/www/wordpress/wp-content/plugins/wp-postratings/wp-postratings.php on line 690

Warning: Cannot modify header information – headers already sent by (output started at /data/members/paid/m/a/maxx-online.nl/htdocs/www/wordpress/wp-content/plugins/mobilepress/mobilepress.php:26) in /data/members/paid/m/a/maxx-online.nl/htdocs/www/wordpress/wp-login.php on line 260

Warning: Cannot modify header information – headers already sent by (output started at /data/members/paid/m/a/maxx-online.nl/htdocs/www/wordpress/wp-content/plugins/mobilepress/mobilepress.php:26) in /data/members/paid/m/a/maxx-online.nl/htdocs/www/wordpress/wp-login.php on line 272

Warning: Cannot modify header information – headers already sent by (output started at /data/members/paid/m/a/maxx-online.nl/htdocs/www/wordpress/wp-content/plugins/mobilepress/mobilepress.php:26) in /data/members/paid/m/a/maxx-online.nl/htdocs/www/wordpress/wp-login.php on line 274

Is there a fix?