Fatal error: HordeSession is not a class in page.inc on line 18

[Jose A. Muñoz Blanco]

Hi,.

Im trying to install Imp/Horde application, but after install Horde I
allways receive the following message when I tyr to conecct with the web
server

Fatal error: HordeSession is not a class in page.inc on line 18

I think that I have follow all the installation instructions but I
receive  allways the same message.

Can I help me