Hi.. I am getting the nullpointerexception from LinkedList. But I am wondering why it happened because I googled and found that it has already been fixed in version 3?

INFO | jvm 1 | 2010/03/02 13:21:11 | Caused by: java.lang.NullPointerException

INFO | jvm 1 | 2010/03/02 13:21:12 | at org.drools.util.LinkedList.remove(LinkedList.java:113)

INFO | jvm 1 | 2010/03/02 13:21:12 | at org.drools.common.RuleFlowGroupImpl.removeActivation(RuleFlowGroupImpl.java:196)

INFO | jvm 1 | 2010/03/02 13:21:12 | at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:993)

INFO | jvm 1 | 2010/03/02 13:21:12 | at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:917)

INFO | jvm 1 | 2010/03/02 13:21:12 | at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1126)

INFO | jvm 1 | 2010/03/02 13:21:12 | at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:697)

INFO | jvm 1 | 2010/03/02 13:21:12 | at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:663)

INFO | jvm 1 | 2010/03/02 13:21:12 | at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:200)