Hi, I'm using Drools BRMS 4.0.1 and when I try to build a package including some rules using an accumulate construct, I get the following error: "org.drools.base.accumulators.CountAccumulateFunction" (This message is shown in an alert). This is a simple rule (Technical DRL rule) to reproduce the error (just put this in an empty package and try to build the whole package): rule "test" salience 0 dialect "java" when Number() from accumulate ( i : Object(), count( i ) ) then System.out.println(1); end The rule is correctly validated but building the whole package leads to the above error. Is it a bug? Regards, CG -- View this message in context: http://www.nabble.com/org.drools.base.accumulators.CountAccumulateFunctio... Sent from the drools - user mailing list archive at Nabble.com.