Troubles with Flex Image plugin...

Hi! I am learning to use rails, and I want to use Fleximage plugin.
But I can't see how nice it is, because I can't make it work.

So, what i have..
model "account" with blob field "image_file_data",
account acts_as_fleximage.

I installed ImageMagic and RMagic, I use InstantRails 2.0.

Everything seems to work, before I try ry save record..
When i submit form, i get error:
"unable to open image `emp/CGI.2844.10': No such file or directory"

Thank you in advance!

here is the code:
(EDIT VIEW)

<% form_for(@account, :html => { :multipart => true }) do |f| %>
...
<p>
<b>Upload Image</b><br />
<%= f.file_field :image_file %><br />
or URL: <%= f.text_field :image_file_url %>
</p>
<p>
<%= f.submit "Update" %>
</p>
<% end %>

(CONTROLLER)

def update
params[:account][:city_id]= params[:city][:id]
@account = Account.find(params[:id])
respond_to do |format|
if @account.update_attributes(params[:account])
flash[:notice] = 'Account was successfully updated.'
format.html { redirect_to(@account) }
format.xml { head :ok }
else
format.html { render :action => "edit" }
format.xml { render :xml => @account.errors, :status =>
:unprocessable_entity }
end
end
end

error:
"unable to open image `emp/CGI.2844.10': No such file or directory"
...
vendor/plugins/fleximage/lib/fleximage/model.rb:224:in `read'
vendor/plugins/fleximage/lib/fleximage/model.rb:224:in `image_file='
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/base.rb:2117:in
`send'
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/base.rb:2117:in
`attributes='
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/base.rb:2116:in
`each'
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/base.rb:2116:in
`attributes='
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/base.rb:2033:in
`update_attributes'
...
Request

Parameters:

{"city"=>{"id"=>"1"},
"commit"=>"Update",
"account"=>{"birthday(2i)"=>"9",
"image_file"=>#<File:C:/WINDOWS/Temp/CGI.2844.10>,
"birthday(3i)"=>"17",
"image_file_url"=>"",
"name1"=>"adasd",
"name2"=>"asdasd",
"city_id"=>"1",
"name3"=>"asasd",
"birthday(1i)"=>"2008"},
"_method"=>"put",
"authenticity_token"=>"adf9d72796dc8b9adb3fe92fee5b06322ac44bfd",