I have problem with ant. I woul dlike to use conditions in ant. But i get error of:

BUILD FAILED C:\Projekti\Projekt ANT\build.xml:412: Problem: failed to create task or type Cause: The name is undefined. Action: Check the spelling. Action: Check that any custom tasks/types have been declared. Action: Check that any / declarations have taken place.

and this is code:

<target name="test">

<input message="Write some text: " addproperty="foo" />

<if>
 <equals arg1="${foo}" arg2="bar" />
 <then>
   <echo message="The value of property foo is 'bar'" />
 </then>

 <elseif>
  <equals arg1="${foo}" arg2="foo" />
  <then>
   <echo message="The value of property foo is 'foo'" />
  </then>
 </elseif>


 <else>
   <echo message="The value of property foo is not 'foo' or 'bar'" />
 </else>
</if>

</target>