If not using the form_for/tabular_form_for to display errors - this is a way to cleanly display
the first error. Putting the li tags will make it appear like the standard rails form_for generated
error list.

<%= error_message_on(@account, "owner_id", "<li>", "</li>", "error_message") %>
# returns: <div class="error_message"><li>can't be blank</li></div>"

Error message like form_for

textmate, error, rails

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