[development] node_preview return access denied page

[sivaji j.g]

I am working on quiz questions import module. This module allows quiz
authors to create bulk of questions from csv text files. I have no problem
in creating questions node from imported file and saving it to database.

I would like to show a preview of import question (which are nodes) before
they get saved into database. Node object generated from file looks like
http://drupalbin.com/10639 . When i call node_view or node_preview with this
node object it returns access denied page. Is there anything i need to do
before calling node_preview ?
Any help will be greatly appreciated.



-- 
Thanks
Sivaji
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