SDK - Cohort Definition Class not Found

NFO - ServiceContext.doneRefreshingContext(913) |2015-12-18 08:20:37,933| Done refreshing Context
Exception in thread "Thread-19" java.lang.NoClassDefFoundError: org/openmrs/module/reporting/cohort/definition/CohortDefinition
	at java.lang.Class.getDeclaredConstructors0(Native Method)
	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
	at java.lang.Class.getDeclaredConstructors(Class.java:2020)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:231)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1002)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:975)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:487)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:628)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
	at org.openmrs.module.ModuleUtil.refreshApplicationContext(ModuleUtil.java:832)
	at org.openmrs.module.web.WebModuleUtil.refreshWAC(WebModuleUtil.java:962)
	at org.openmrs.web.Listener.performWebStartOfModules(Listener.java:630)
	at org.openmrs.web.Listener.performWebStartOfModules(Listener.java:609)
	at org.openmrs.web.Listener.startOpenmrs(Listener.java:252)
	at org.openmrs.web.WebDaemon$1.run(WebDaemon.java:42)
Caused by: java.lang.ClassNotFoundException: org.openmrs.module.reporting.cohort.definition.CohortDefinition
	at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
	at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:429)
	at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:382)
	at org.openmrs.module.ModuleClassLoader.loadClass(ModuleClassLoader.java:544)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)