i can't login

[Outlaw]

i installed isp on slackware but i can't login to admin. I have messagess:

Code:

We are sorry, but the system is currently under maintenance.
Please try again later.

i click administrator login. i write login and pass and click login. I have again:

Code:

We are sorry, but the system is currently under maintenance.
Please try again later.

I set: chmod -R 0777 /var/www/ispcp/gui/include/htmlpurifier/HTMLPurifier/DefinitionCache/Serializer

but this don't change anything ;/