'WSO2AM-4.0.0 Devportal : Error occurred while executing SubscriberKeyMgtClient

The api was published from https://hostname:9443/publisher , then try to subscribe an app to invoke it ，there was no response when click next button， the error occured in console.

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Error：

Caused by: org.wso2.carbon.apimgt.api.APIManagementException: Error occurred while executing SubscriberKeyMgtClient.
    at org.wso2.carbon.apimgt.impl.utils.APIUtil.handleException_aroundBody84(APIUtil.java:1971)
    at org.wso2.carbon.apimgt.impl.utils.APIUtil.handleException(APIUtil.java:1968)
    at org.wso2.carbon.apimgt.impl.workflow.AbstractApplicationRegistrationWorkflowExecutor.dogenerateKeysForApplication_aroundBody8(AbstractApplicationRegistrationWorkflowExecutor.java:183)
    at org.wso2.carbon.apimgt.impl.workflow.AbstractApplicationRegistrationWorkflowExecutor.dogenerateKeysForApplication(AbstractApplicationRegistrationWorkflowExecutor.java:125)
    at org.wso2.carbon.apimgt.impl.workflow.AbstractApplicationRegistrationWorkflowExecutor.generateKeysForApplication_aroundBody6(AbstractApplicationRegistrationWorkflowExecutor.java:121)
    at org.wso2.carbon.apimgt.impl.workflow.AbstractApplicationRegistrationWorkflowExecutor.generateKeysForApplication(AbstractApplicationRegistrationWorkflowExecutor.java:118)
    at org.wso2.carbon.apimgt.impl.workflow.ApplicationRegistrationSimpleWorkflowExecutor.complete_aroundBody2(ApplicationRegistrationSimpleWorkflowExecutor.java:77)
    ... 59 more
Caused by: org.wso2.carbon.apimgt.api.APIManagementException: Error occurred while calling token endpoint!
    at org.wso2.carbon.apimgt.impl.AMDefaultKeyManagerImpl.getNewApplicationAccessToken_aroundBody12(AMDefaultKeyManagerImpl.java:404)
    at org.wso2.carbon.apimgt.impl.AMDefaultKeyManagerImpl.getNewApplicationAccessToken(AMDefaultKeyManagerImpl.java:379)
    at org.wso2.carbon.apimgt.impl.workflow.AbstractApplicationRegistrationWorkflowExecutor.dogenerateKeysForApplication_aroundBody8(AbstractApplicationRegistrationWorkflowExecutor.java:172)
    ... 63 more
Caused by: org.wso2.carbon.apimgt.impl.kmclient.KeyManagerClientException: Received status code: 401 Reason: 
    at org.wso2.carbon.apimgt.impl.kmclient.KMClientErrorDecoder.decode_aroundBody0(KMClientErrorDecoder.java:29)
    at org.wso2.carbon.apimgt.impl.kmclient.KMClientErrorDecoder.decode(KMClientErrorDecoder.java:27)
    at feign.AsyncResponseHandler.handleResponse(AsyncResponseHandler.java:96)
    at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:138)
    at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:89)
    at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:100)
    at com.sun.proxy.$Proxy431.generate(Unknown Source)
    at org.wso2.carbon.apimgt.impl.AMDefaultKeyManagerImpl.getNewApplicationAccessToken_aroundBody12(AMDefaultKeyManagerImpl.java:401)
    ... 65 more
wso2-am


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