[rules-users] Regarding using lessthan(<) and lessthan or equal(<=) operator in rules file

Hi All, I am using lessthan(<) and less than or equal (<=) operator in LHS part of a XML rule file which is like this. <eval> obj.getValue < 10 </eval> but when i am giving it to rule engine for execution, its throwing the following exception: (null: 1, 214): cvc-elt.1: Cannot find the declaration of element 'package'. (null: 1, 569): The content of elements must consist of well-formed character data or markup. RuleException(javax.rules.admin.RuleExecutionSetCreateException: cannot create rule execution set), root cause( org.drools.compiler.DroolsParserException) at org.drools.jsr94.rules.admin.LocalRuleExecutionSetProviderImpl.createRuleExecutionSet(Unknown Source) at com.unisys.mint.admin.rules.MCPRuleEngine.applyRule( MCPRuleEngine.java:104) at com.unisys.mint.sdk.services.managerules.MCPRuleManager.applyRule( MCPRuleManager.java:63) at com.unisys.mint.sdk.services.managerules.TestNewRuleClass.applyRule( TestNewRuleClass.java:124) at com.unisys.mint.sdk.services.managerules.TestNewRuleClass.main( TestNewRuleClass.java:40) Caused by: org.drools.compiler.DroolsParserException at org.drools.compiler.PackageBuilder.addPackageFromXml(Unknown Source) ... 5 more Caused by: org.drools.compiler.DroolsParserException at org.drools.compiler.PackageBuilder.addPackageFromXml(Unknown Source) at org.drools.jsr94.rules.admin.LocalRuleExecutionSetProviderImpl.createRuleExecutionSet(Unknown Source) at com.unisys.mint.admin.rules.MCPRuleEngine.applyRule( MCPRuleEngine.java:104) at com.unisys.mint.sdk.services.managerules.MCPRuleManager.applyRule( MCPRuleManager.java:63) at com.unisys.mint.sdk.services.managerules.TestNewRuleClass.applyRule( TestNewRuleClass.java:124) at com.unisys.mint.sdk.services.managerules.TestNewRuleClass.main( TestNewRuleClass.java:40) java.lang.NullPointerException at com.unisys.mint.sdk.services.managerules.TestNewRuleClass.applyRule( TestNewRuleClass.java:125) at com.unisys.mint.sdk.services.managerules.TestNewRuleClass.main( TestNewRuleClass.java:40) cannot create rule execution set please help me to solve this. Thanks in advance, Mahantesh.