Erreur : Pas de tache For

Bonjour,

j'essai en vain de faire une bete boucle for sur un file set, et a chaque fois j'obtiens :

Code:

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An Ant BuildException has occured: The following error occurred while executing this line:
/home/eclesia/dev/puzzle/puzzle-gis/trunk/builder/build.xml:172: Problem: failed to create task or type for
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> declarations have taken place.

voici le code :

Code:

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<for param="file">
            <path>
                <fileset refid="go3"/>
            </path>
            <sequential>
                <cleanMetaInf jar="@{file}" />
            </sequential>
        </for>

Si quelqu'un a une idée ...