[Rails] NoMethodError

I'm trying to create an "Inventory" application that has two models:

1- item
2- itemdetails

I have made a "relationship" between those two models, such that:

item has_many itemdetails

Once I try to create an item or itemdetail I get a NoMethodError as
follows: http://pastie.org/private/wvqtorzl12vrkrudzc8ha

This also applies if I wnt to "show".

The weird thing aslo is that when I get the NoMethodError page after I
add an item gets created, I find that I get a message that the item hs
been cteated succssfully.

And, attached are the files to show what I hav e did?

Any ideas on this?

Thanks a lot.

Attachments:
http://www.ruby-forum.com/attachment/4858/files.zip

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