Almost every single rule file now throws this exception when it gets added to the knowledge base.
java.lang.NoSuchMethodError: org.drools.base.ClassFieldReader.hasReadAccessor()Z
at org.drools.base.ClassFieldAccessorStore.getReader(ClassFieldAccessorStore.java:129)
at org.drools.base.ClassFieldAccessorStore.getReader(ClassFieldAccessorStore.java:104)
at org.drools.rule.builder.PatternBuilder.getFieldReadAccessor(PatternBuilder.java:1572)
at org.drools.rule.builder.PatternBuilder.buildRuleBindings(PatternBuilder.java:1123)
at org.drools.rule.builder.PatternBuilder.buildCcdDescr(PatternBuilder.java:691)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:651)
at org.drools.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternBuilder.java:505)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:322)
at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:133)
at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:67)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:85)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:3169)
at org.drools.compiler.PackageBuilder.compileRules(PackageBuilder.java:1036)
at org.drools.compiler.PackageBuilder.compileAllRules(PackageBuilder.java:944)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:936)
at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:468)
at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:698)
at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:51)
at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:40)
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