上传 excel 文件，然后用 roo 读取文件内容， 报错代码xlsx = Roo::Spreadsheet.open(tmp_file) 报Zip::Error (Zip end of central directory signature not found):错误 google 有类似，但是解决不了 以下是我的代码

def import
    tmp_file = "#{Rails.root}/tmp/import_xls.xlsx"
    FileUtils.mv params['import_xls'].tempfile.path, tmp_file
    require 'roo'
    xlsx = Roo::Spreadsheet.open(tmp_file)
    xlsx.each_row_streaming do |row|
      begin
        order = Order.where(trade_no: "#{row[0]}").first
        if not order.blank?
          order.update_attributes!(
            state: :sent,
            express_company: "#{row[7]}",
            express_no: "#{row[8]}"
          )
        end
      rescue => exception
        Rails.logger.info exception
      end
    end
    render json: { success: 1, msg: "导入成功." }
  end