When I try to using custom directory connector, Nullpoint Exception occur....

[David Choi]

2021-02-26 16:51:50,731 http-nio-8095-exec-1 ERROR [console.action.application.ViewApplication] java.lang.NullPointerException
java.lang.RuntimeException: java.lang.NullPointerException
at com.atlassian.crowd.manager.authentication.RetryingTokenAuthenticationManager.authenticateUser(RetryingTokenAuthenticationManager.java:74)
at sun.reflect.GeneratedMethodAccessor681.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:295)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy96.authenticateUser(Unknown Source)
at sun.reflect.GeneratedMethodAccessor681.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at com.atlassian.spring.interceptors.SpringProfilingInterceptor.invoke(SpringProfilingInterceptor.java:16)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy97.authenticateUser(Unknown Source)
at com.atlassian.crowd.console.action.application.ViewApplication.isValidTestAuthentication(ViewApplication.java:228)
at com.atlassian.crowd.console.action.application.ViewApplication.configTest(ViewApplication.java:117)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:899)
at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1544)
at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
....

I follow the code in this page(here ) 

and try to testAuthenticate in application tab in crowd console. but nullpoint exeption occur.. how can i solve it?