Deploy in Eclips error

Buildfile: D:ProjectsNuxeoSourceorg.nuxeo.ecm.webappbuild.xml

 

BUILD FAILED
D:ProjectsNuxeoSourceorg.nuxeo.ecm.webappbuild.xml:6: Could not create task or type of type: urn:maven-artifact-ant:pom.

 

Ant could not find the task or a class this task relies upon.

 

This is common and has a number of causes; the usual
solutions are to read the manual pages then download and
install needed JAR files, or fix the build file:
 - You have misspelt 'urn:maven-artifact-ant:pom'.
  ; Fix: check your spelling.
 - The task needs an external JAR file to execute
  ;   and this is not found at the right place in the classpath.
   Fix: check the documentation for dependencies.
 ;  Fix: declare the task.
 - The task is an Ant optional task and the JAR file and/or libraries
  ;   implementing the functionality were not found at the time you
     yourself built your installation of Ant from the Ant sources.
   Fix: Look in the ANT_HOME/lib for the 'ant-' JAR corresponding to the
   ;  task and make sure it contains more than merely a META-INF/MANIFEST.MF.
     If all it contains is the manifest, then rebuild Ant with the needed
    ; libraries present in ${ant.home}/lib/optional/ , or alternatively,
   ;  download a pre-built release version from apache.org
 - The build file was written for a later version of Ant
   Fix: upgrade to at least the latest release version of Ant
 - The task is not an Ant core or optional task
 &nbsp; &nbsp; and needs to be declared using <taskdef>.
&nbsp;- You are attempting to use a task defined using
 &nbsp;  <presetdef> or <macrodef> but have spelt wrong or not
 &nbsp; defined it at the point of use

&nbsp;

Remember that for JAR files to be visible to Ant tasks implemented
in ANT_HOME/lib, the files must be in the same directory or on the
classpath

&nbsp;

Please neither file bug reports on this problem, nor email the
Ant mailing lists, until all of these causes have been explored,
as this is not an Ant bug.

&nbsp;

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