[symfony-users] Upload image with admin generator

Hi,
I'd like to upload image using admin generator. I've tried set field
type in my generator.yml to:

      edit:
        title:          Editing photo "%%title%%"
        fields:
          path_thumb:
            type: admin_input_file_tag
            help: default size 25x25

but it doesn't work. Default input field is displayed and error
message returned.

how can I upload images by admin generator? I use symfony version
1.2.8.

Thanks in advance!
bogo

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