Forum OpenACS Q&A: value given for parameter "key" to "_"

Hi all,

I've recently installed OpenACS 5.1.1, Postgresql 7.4 and so on...everything seems fine, aparently no intallation errors.

The problem is, I can't access any of the admin pages or resources, not even login...always the same error :
Error in include template "/web/mywebsite/packages/acs-subsite/lib/login": no value given for parameter "key" to "_" or whatever is the page i try to access...

I would guess that the templating package has bug, although i wasn't unable to figure it out.

Any ideas? Many thanks