The value of attribute "evaluator" associated with an element type "literal-restriction" must not contain the '<' character.

java.lang.RuntimeException: org.drools.compiler.DroolsParserException: org.xml.sax.SAXParseException: The value of attribute "evaluator" associated with an element type "literal-restriction" must not contain the '<' character.
at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:692)
at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:37)
at com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:72)
at com.sample.DroolsTest.main(DroolsTest.java:46)
Caused by: org.drools.compiler.DroolsParserException: org.xml.sax.SAXParseException: The value of attribute "evaluator" associated with an element type "literal-restriction" must not contain the '<' character.
at org.drools.compiler.PackageBuilder.addPackageFromXml(PackageBuilder.java:443)(null: 10, 39): The value of attribute "evaluator" associated with an element type "literal-restriction" must not contain the '<' character.

at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:598)
... 3 more