[rules-users] Build Error: Unknown language MVEL

[edemmorny]

Hi, 

I'm using the guvnor that comes with the jbpm-5.2.0.Final-installer-full
download. I have a package in which I've created a process with condition
expressions. When I build the package, I get the following error message on
the Drools designer: 

unable to parse xml : Exception class java.lang.IllegalArgumentException :
Unknown language http://www.mvel.org/2.0

My business process definintion is attached to this post. Any ideas on why
this could be happening please? 

http://drools.46999.n3.nabble.com/file/n3786348/patientVisit.xml
patientVisit.xml 

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