Forum OpenACS Q&A: File not find error after instaling some packages

Well, I am want to build a small site with OpenACS but after installing, when I add application to the site I get some error. From the begining everything works smooth till I add the New portal. It is added fine but after when I go to the admin page and I try to configure it it just give "File not find error". No other information comes with this and I do not know what could be the reason for that. I've tryed with some other packages and I observed that some of them worked fine (Edit this page, New, etc.) buth not all. Anyway, for me the portal is important to work so any help is wellcome. cheers Dimitar