[rules-users] drools with IKVM

We are using Drools engine on our client written in C#. We are using IKVM to convert the drools jar and our java beans into dll's using IKVM. We have a rule similar to this:- rule "aggregate rule" when $b : Bill(billAmount > 100) $n : Number(doubleValue > 100) from accumulate ( $l : LineItem() from $b.findItems("color", "blue"), sum($l.getSellingValue())) then VoucherSeries fact0 = new VoucherSeries(); fact0.setSeriesCode( "aggregate voucher" ); insert(fact0 ); voucherlist.add(fact0); System.out.println("sum" + $n); end This rule works fine when it is run with java based drools API's, but while running it with IKVM converted drools, it throws the following error:- Unable to cast object of type 'AccumulateMemory' to type 'FromMemory'. Any ideas on what might be going wrong ? thanks, piyush