#375 error in installation

[Anonymous]

Name: Rick Sumook
Email: rsumook@tailin.net

Hello,

It is my first time to install the phpopenchat in linux, I am using mandrake community 10.1.

all basic requirements for that program are installed in my PC.

And i follow the instruction, and i used this method to install that program:
http://localhost/phpopenchat/install.php

all are succesfully setup but when i click "Now login to your new high performance chat server"
it show me an error:

"Unkown Error

Sorry, an error occurred.
at /var/www/html/phpopenchat/index.php:64
[8] A session had already been started - ignoring session_start()

Your webserver has no write permissions in "/var/www/html/phpopenchat/tmp"!
Use the Installer to install your chat! Or in your favorite shell, do the following:
chmod 777 /var/www/html/phpopenchat/tmp
and press ENTER."

but i already set the permission...
is this a bug...

please can you help me to work this program...

Thank you...

RHSumook