[otrs] can't login - installation problem

[Konstantin webuser]

Hi there,

I just installed from source the latest otrs version on a debian 4.0 box
running PostgreSQL 8.1 and Apache 2.2.x.

I followed all the steps, as described, in the documentation and everything
worked fine. After I displayed the login page and tried to login I get the
following error:

------------------------------
------------------------------------------------

 Error: Can't write /opt/otrs/Kernel/Config/Files/ZZZAAuto.pm: Permission
denied!
Comment:
Bug Report:
Traceback:     ERROR: OTRS-CGI-10 Perl: 5.8.8 OS: linux

Message: Can't write /opt/otrs/Kernel/Config/Files/ZZZAAuto.pm: Permission
denied!

Traceback (10512):
   Module: Kernel::System::Config::WriteDefault (v1.64) Line: 247
   Module: Kernel::Modules::AdminInit::Run ( v1.4) Line: 56
   Module: Kernel::System::Web::InterfaceAgent::Run (v1.23) Line: 670
   Module: /opt/otrs/bin/cgi-bin/index.pl (v1.81) Line: 47

-----------------------------------------------------------------------------


The Apache error_log showed the following too:

---------------------------------------------------------------

Message: Can't write cache file
/opt/otrs/var/tmp/SysConfig-Cache_Kernel_Config_Files_Framework
.xml-3d15c3528f10ac2fe6ba954cf5ecffe5.pm: Permission denied

Can't write cache file
/opt/otrs/var/tmp/SysConfig-Cache_Kernel_Config_Files_Ticket.xm
l-f8dd006d03246fc35157870503272558.pm: Permission denied,
-------------------------------------------------------------

any help is much appreciated.

Thanks
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