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I have some problem during the install of pligg2.0.1 on my server. I arrive at step 4 (passaggio 4 in Italian) and I see just a blank page. At the top I've this warning:


Warning: session_start() [function.session-start]: open(/tmp/sess_pth8f5qn0u7uh9a2jldop5job2, O_RDWR) failed: No such file or directory (2) in /pligg/install/install.php on line 2
PHP Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /pligg/install/install.php:2) in /pligg/install/install.php on line 2
Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /pligg/install/install.php:2) in /pligg/install/install.php on line 2
PHP Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /pligg/install/install.php:2) in /pligg/install/install.php on line 2
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /pligg/install/install.php:2) in /pligg/install/install.php on line 2

What does it mean? What can I do?
Sorry in advance if there is the same topic elsewhere but I'm new and I didn't find some of usefull for my problem.