Permission denied errors

Support & Bugs
1

I installed piwik without any failures,
but sometimes I get this:
session_start() [function.session-start]: ps_files_cleanup_dir: opendir(/tmp) failed: Permission denied (13)
in ‘/www/htdocs/w00aaa5b/bizzstats-webmatics/piwik/index.php’ at the line 40

#0 Piwik_ErrorHandler(8, session_start() [function.session-start]: ps_files_cleanup_dir: opendir(/tmp) failed: Permission denied (13), /www/htdocs/w00aaa5b/bizzstats-webmatics/piwik/index.php, 40, Array
#1 session_start() called at [/www/htdocs/w00aaa5b/bizzstats-webmatics/piwik/index.php:40]

after reloading this is gone and everything is fine!
anyway - this is anoying.
can anybody help?
rgds.
piotre

2

Make sure the /tmp directory in your piwik install is writable by the web server…

3

of course I did this because installation would fail if i did it not!
so this is not the problem.