Rails - Sep 2006 - Problem with file upload

I have a problem with file upload on server. The following code:
----------------------------------------------------------------

def UploadFile(jpg, folder, name)
  if (!jpg.nil? and !jpg.local_path.nil? and
FileTest.exists?(jpg.local_path))
    if ((''image/jpeg'' == jpg.content_type.to_s.rstrip) ||
(''image/pjpeg''
== jpg.content_type.to_s.rstrip))
      unless File.exists?(folder)
        FileUtils.mkdir_p(folder)
        File.chmod(0750, folder)
      end
      filename = File.expand_path(File.join(folder, name))
      File.unlink(filename) if FileTest.exists?(filename)
    ! FileUtils.cp_r(jpg.local_path, filename)
      File.chmod(0644, filename)
      return true
    else
      return false
    end
  else
    return false
  end
end

----------------------------------------------------------------
crashes while trying to load file(usually smaller than 16 Kb, becouse 
small files send as StringIO ex:
"imgfile"=>#<StringIO:0xb77f9e80>, but
for big files only link to tmp file sends to server ex: 
"imgfile"=>#<File:/tmp/CGI29745.5>). The error occurs on a
string
matched by !. Here is error for small file:
----------------------------------------------------------------

NoMethodError (You have a nil object when you didn''t expect it!
The error occured while evaluating nil.to_str):
    /usr/local/lib/ruby/1.8/fileutils.rb:1389:in `fu_each_src_dest0''
    /usr/local/lib/ruby/1.8/fileutils.rb:1375:in `fu_each_src_dest''
    /usr/local/lib/ruby/1.8/fileutils.rb:422:in `cp_r''

----------------------------------------------------------------
Could anyone help me with my problem? Storing small images in database 
is silly. IMHO of course.

-- 
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