```ruby
class MoveOldFilesToPaperclip < ActiveRecord::Migration
  def self.up
    ProjectFile.all.each do |file|
      filename=file.attributes['filename']
      store_name =  "#{file.id}#{"_" + file.task_id.to_s if file.task_id.to_i > 0}_#{filename}"
      full_name= File.join("#{RAILS_ROOT}", 'store', file.company_id.to_s, store_name)
      if File.exist?(full_name)
        file.file= File.new(full_name)
        file.save!
      end
    end
  end

  def self.down
  end
end
```

Add more clear error messaged to move_old_files_to_paperclip migration.
user
```ruby
class MoveOldFilesToPaperclip < ActiveRecord::Migration
  def self.up
    ProjectFile.all.each do |file|
      filename=file.attributes['filename']
      store_name =  "#{file.id}#{"_" + file.task_id.to_s if file.task_id.to_i > 0}_#{filename}"
      full_name= File.join("#{RAILS_ROOT}", 'store', file.company_id.to_s, store_name)
      if File.exist?(full_name)
        begin
          file.file= File.new(full_name)
          file.save!
        rescue Exception => e
          puts "Call to parerclip raise an exception"
          puts "File: #{full_name}"
          puts "Paperclip.options hash:"
          p Paperclip.options
          raise e
        end
      end
    end
  end

  def self.down
  end
end
```
assistant