[Exist-open] ant task

[sergio d. a. <se...@sb...>]

hi,
some of you told me about loading files in my existe db integrated in 
cocoon by means of ant task.
I am new to ant task so i am trying but without success.
i added a target entry to my build.xml of /usr/local/exist/build.xml file.

    <target name="store">
      <taskdef resource="org/exist/ant/antlib.xml">
        <classpath refid="classpath.core"/>
      </taskdef>
      <xdbstore 
uri="xmldb:exist://localhost:8080/cocoon/exist/xmlrpc/db/collections/photos">
      <fileset dir="/photos">
        <include name="*.xml"/>
      </fileset>
      </xdbstore>
    </target>

but when i do
$> ant store
insted of storing my xml files under photos folder into my photos 
collections i get
]# ant store
Buildfile: build.xml

store:
Trying to override old definition of task move
Trying to override old definition of task copy
Trying to override old definition of task chmod
Trying to override old definition of task chown

BUILD FAILED
/usr/local/exist/build.xml:1116: Could not create task or type of type: 
xdbstore.

Can anyone help how to do this. I really need to store those xml files 
quickly and i am getting desperate because i have been trying the whole 
day with success.
thanks in advanced,
Sergio