[rules-users] [Newbie] Can't execute BRMS Discount insurance brokers tutorial

[Massimo Frossi]

I' ve gone a little bit forward in the meantime,  I've installed
drools-4.0.0-examples.zip, drools-4.0.0-eclipse.zip,
drools-4.0.0-brms.zip and followed the whole tutorial without errors,
but when I execute the main class i get the following error:

RuleAgent(insuranceconfig) INFO (Thu Jul 26 18:01:28 CEST 2007):
Configuring with newInstance=true, secondsToRefresh=30
RuleAgent(insuranceconfig) INFO (Thu Jul 26 18:01:28 CEST 2007):
Configuring package provider : URLScanner monitoring URLs:
http://localhost:8080/drools-jbrms/org.drools.brms.JBRMS/package/org.acme.insurance/fmeyer
RuleAgent(insuranceconfig) EXCEPTION (Thu Jul 26 18:01:29 CEST 2007):
org.mvel.CompiledExpression; local class incompatible: stream classdesc
serialVersionUID = -8459552198577984707, local class serialVersionUID =
-1994048675652702021. Stack trace should follow.
java.io.InvalidClassException: org.mvel.CompiledExpression; local class
incompatible: stream classdesc serialVersionUID = -8459552198577984707,
local class serialVersionUID = -1994048675652702021

I see that there is a mismatch between different mvel libraries, but I
couldn't come to a final solution...could you please tell me what am I
doing wrong?
Thank you,
Max