[ccnet-user] Can't add attachments in email publisher

[agentZuluka]

I am trying to simply attach a file in email publisher:

      <email mailhost="localhost" from="sam...@sample.com">
        <includeDetails>True</includeDetails>
        <users>
          <user name="user" address="u...@user.com" group="QA" />
                  </users>
        <groups>
          <group name="QA">
           <notifications>
                        <notificationType>Always</notificationType>
           </notifications>
                   </group>
        </groups>
                <attachment>
                        <file>somefile.mht</file>
                </attachments>
      </email>

And CC.NET server cannot start dropping this error:

[CCNet Server:ERROR] Exception: Unused node detected:
<attachments><file>somefile.mht</file></attachments>

I am using CC.NET version : 1.5.117.5721