[ic] order profile not found

[Ian]

On submitting an order via checkout.html, the following error is logged in
the error log:
/~catalogname/cgi-bin/cart.cgi/process.html Order profile order_profile not
found

Having gone through the mailing list and documentation, I am unable to see
why. Here are some minimum settings I have applied to try to get it to work:

In catalog.cfg::
OrderProfile    etc/profiles.order

Minimum etc/profiles.order
__NAME__ order_profile
fname=required
lname=required
address1=required
city=required
&fatal=yes
&final=yes
__END__

Relevant line in checkout.html:
<input type=hidden name=mv_order_profile value=order_profile>


The result is that the checkout.html page is refreshed.
No error messages are reflected on the refreshed page or missing text
highlighted.
All text fields on the form have an entry.

Any help appreciated.

Regards
Ian