[NAntC-Dev] invalid task / type error

[shikari shambu]

I have a build file that uses the Nantcontrib's version task to create the 
version number. This task was working when I was using .84 version of 
Nant/Nantcontrib. Then, I downloaded the latest nightly build of both Nant 
and Nantcontrib. And, now I get this error

invalid element <version>. Unknown task or datatype.
The task in the build file is
<target name="ver" depends="checkout">
	<version buildtype="monthday" revisiontype="automatic" 
startDate="${Build.StartDate}"/>
</target>

Any idea what may be causing this issue?
TIA
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