strange error during deploy on hosting

[eluser]jenie_net[/eluser]
Hi all,

I've just made a project for a customer.
During development i had no problems, development was on a MAC, with MAMP installed.

I've just depoyed my application and i get these two errors!
I'm going mad...why!??
one is this

Warning: is_dir() [function.is-dir]: open_basedir restriction in effect. File(application) is not within the allowed path(s): (/var/www/web164/html/:/var/www/web164/phptmp/:/var/www/web164/files/:/var/www/web164/atd/) in /var/www/web164/html/index.php on line 93

and this error is the second

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /var/www/web164/html/index.php:93)

Filename: libraries/Session.php

Line Number: 295

can someone help me??
I 'm in ruine...

Thanks in advance

Stefano Marino

[eluser]dbashyal[/eluser]
check this
http://au.php.net/features.safe-mode

as soon as u fix 1st u won't see 2nd.