Failed to locate a principal

java.lang.IllegalArgumentException: Failed to locate a principal with principal name 'kr'
    at org.kuali.rice.krad.UserSession.initPerson(UserSession.java:83)
    at org.kuali.rice.krad.UserSession.<init>(UserSession.java:71)
    at org.kuali.rice.krad.service.impl.PostProcessorServiceImpl.establishPostProcessorUserSession(PostProcessorServiceImpl.java:400)
    at org.kuali.rice.krad.service.impl.PostProcessorServiceImpl.doRouteStatusChange(PostProcessorServiceImpl.java:60)
    at sun.reflect.GeneratedMethodAccessor1863.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at com.sun.proxy.$Proxy96.doRouteStatusChange(Unknown Source)
    at org.kuali.rice.krad.workflow.postprocessor.KualiPostProcessor.doRouteStatusChange(KualiPostProcessor.java:56)
    at org.kuali.rice.kew.messaging.exceptionhandling.ExceptionRoutingServiceImpl.notifyStatusChange(ExceptionRoutingServiceImpl.java:143)
    at org.kuali.rice.kew.messaging.exceptionhandling.ExceptionRoutingServiceImpl.activateExceptionRequests(ExceptionRoutingServiceImpl.java:211)
    at org.kuali.rice.kew.messaging.exceptionhandling.ExceptionRoutingServiceImpl.placeInExceptionRouting(ExceptionRoutingServiceImpl.java:123)
    at org.kuali.rice.kew.messaging.exceptionhandling.ExceptionRoutingServiceImpl.placeInExceptionRouting(ExceptionRoutingServiceImpl.java:86)
    at org.kuali.rice.kew.messaging.exceptionhandling.ExceptionRoutingServiceImpl.placeInExceptionRouting(ExceptionRoutingServiceImpl.java:67)
    at sun.reflect.GeneratedMethodAccessor2144.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at com.sun.proxy.$Proxy381.placeInExceptionRouting(Unknown Source)
    at org.kuali.rice.kew.messaging.exceptionhandling.DocumentMessageExceptionHandler.placeInException(DocumentMessageExceptionHandler.java:36)
    at org.kuali.rice.ksb.messaging.exceptionhandling.DefaultMessageExceptionHandler.handleException(DefaultMessageExceptionHandler.java:44)
    at org.kuali.rice.ksb.messaging.exceptionhandling.DefaultExceptionServiceImpl.placeInExceptionRouting(DefaultExceptionServiceImpl.java:64)
    at sun.reflect.GeneratedMethodAccessor1719.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at com.sun.proxy.$Proxy380.placeInExceptionRouting(Unknown Source)
    at org.kuali.rice.ksb.messaging.MessageServiceInvoker.placeInExceptionRouting(MessageServiceInvoker.java:123)
    at org.kuali.rice.ksb.messaging.MessageServiceInvoker.run(MessageServiceInvoker.java:91)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)