Marketpress update causes error

Hi

i have just updates Marketpress with the latest update and now have the following error.

Please help.

Thanks

Stef

Warning: session_start() [function.session-start]: open(/webtemp/a/l/d/sess_aldpsc5q9s772cnse9c1tscomg4qplep0mbo52gr1c9gmuco4pvn7al9sksogt5ekajm4lcdu021cgp113sb5hhaolv6a1pd0480lv3, O_RDWR) failed: No such file or directory (2) in /www/xxx/xxx/xxx/www.oldewatermill.co.uk/web/wp-content/plugins/marketpress/marketpress.php on line 1034