I would really appreciate if someone could help me on this issue.   Thanks in advance, Jagathesh --- On Wed, 12/10/08, Jagathesh <jagamani(a)yahoo.com&gt; wrote: From: Jagathesh <jagamani(a)yahoo.com&gt; Subject: Re: [rules-users] Error while adding rule package in 5.0.0M2 & 5.0.0M To: "Edson Tirelli" <tirelli(a)post.com&gt; Date: Wednesday, December 10, 2008, 11:18 AM Thanks Edson.   I'm getting the following errors.   [[ERR 103] Line 55:59 no viable alternative at input 'getLevel' in rule "New Event - Level1" in pattern Event] [[ERR 103] Line 176:64 no viable alternative at input '&&' in rule "Check For price"] [[ERR 103] Line 176:79 no viable alternative at input 'format' in rule "Check For price" in pattern PriceDetail] I didn't get any of those while I was using 4.0.7   Thanks, Jagathesh --- On Wed, 12/10/08, Edson Tirelli <tirelli(a)post.com&gt; wrote: From: Edson Tirelli <tirelli(a)post.com&gt; Subject: Re: [rules-users] Error while adding rule package in 5.0.0M2 & 5.0.0M To: jagamani(a)yahoo.com, "Rules Users List" <rules-users(a)lists.jboss.org&gt; Date: Wednesday, December 10, 2008, 9:40 AM    It seems the package you are trying to add is null... did you checked for parsing/compilation errors before trying to add the package into the rulebase? PackageBuilder.getErrors()    []s    Edson 2008/12/10 Jagathesh <jagamani(a)yahoo.com&gt; Hi, When I pointed the rules from Drools 4.0.7 to Drools 5.0.0M2, I'm getting the following errors at runtime. I also tried Drools 5.0.0M3 (same error). The error occurs while adding a package. Could someone help me? Do I've to do something differently for 5.0.0M2?   java.lang.NullPointerException  at org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:420)  at org.drools.reteoo.ReteooRuleBase.addPackage(ReteooRuleBase.java:381)   Thanks, Jagathesh   _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users --  Edson Tirelli  JBoss Drools Core Development  JBoss, a division of Red Hat @ www.jboss.com