Rails - Jan 2006 - error_messages_for >> Cannot convert Array into String

Hi all

I have the following Model:

Member(id, username, first_name, last_name, hashed_password, 
password_salt)

Now I want to allow users to register for an account using the following 
form:

---
		<%= form_tag %>
			<%= error_messages_for ''member'' %>
			<p><%= _(''Username'') %>: <%=
text_field(''member'', ''username'')
%></p>
			<p><%= _(''E-Mail'') %>: <%=
text_field(''member'', ''email'', :id =>
''asdf'') %></p>
			<p><%= _(''Password'') %>: <%=
password_field(''member'', ''password'')
%></p>
			<p><%= _(''Password confirmation'') %>: <%=
password_field(''member'',
''password_confirmation'') %></p>
			<p><%= submit_tag(_(''Register!'')) %></p>
		<%= end_form_tag %>
---

The register action looks like this (the password encryption with salt 
is not built in yet):

---
  def register
    if request.get?
      @member = Member.new
    else
      @member = Member.new(params[:member])
      flash[:notice] = "You account was successfully created! Please 
login now."
      redirect_to :action => "login" if @member.save
    end
  end
---

When I press the submit button, then I get the following error:

---
 TypeError in Member#register

Showing app/views/member/register.rhtml where line #11 raised:

cannot convert Array into String

Extracted source (around line #11):

8: 	<fieldset>
9: 		<legend>Register</legend>
10: 		<%= form_tag %>
11: 			<%= error_messages_for ''member'' %>
12: 			<p><%= _(''Username'') %>: <%=
text_field(''member'', ''username'')
%></p>
13: 			<p><%= _(''E-Mail'') %>: <%=
text_field(''member'', ''email'', :id =>
''asdf'') %></p>
14: 			<p><%= _(''Password'') %>: <%=
password_field(''member'', ''password'')
%></p>

---

What did I wrong? Thanks for help.

Greetings,
Josh

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