Error:MiddleGen Task Not Found

Hi..
We are newbie to the world of  Middlegen. We are trying to use Middlegen 
to develop EJB components. We downloaded Middlegen Binary files and 
through installation procedure as per the Middlegen Home Page. But 
getting the following error.

C:\MiddleGen\samples>ant
Buildfile: build.xml

middlegen:

BUILD FAILED
file:C:/MiddleGen/samples/build.xml:112: taskdef class 
middlegen.MiddlegenTask c
annot be found

Total time: 1 second

Please suggest a quick solution.
Thnx  in advance.



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