error/admin/installsessionerror

I am trying out Moodle 2 on SME Server 8 beta 5 and have got this far after wading though several uppercase/lowercase errors when calling functions etc. I downloaded htmepurifier etc. The next problem to overcome involves cookies. Am I wasting my time trying out Moodle 2 on SME Server beta 5? Any suggestions as to where I go from here?

When I came across this error I just clicked the continue button and the installion went ahead.