我正在使用wso2 ID服务器和KM 5.10.0，以及API管理器3.1.0。这是非常基本的问题。在以前的尝试中，我能够登录到Wso2 Id服务器。但是由于错误，我启动了ID服务器的两个实例。之后，我杀死了两个正在运行的进程，并尝试仅启动一个实例。之后，我将无法登录到wso2 ID服务器。我尝试重新启动整个linux系统并尝试登录，但仍然遇到以下异常。
[2020-06-23 12:02:43,999] [50882c23-5ee1-4406-ae80-0a688cb89a4e] ERROR {org.wso2.carbon.tomcat.ext.valves.CarbonContextCreatorValve} - Could not handle request: /carbon java.lang.NullPointerException
at org.wso2.carbon.tomcat.ext.internal.Utils.getAppNameFromRequest(Utils.java:101)
at org.wso2.carbon.tomcat.ext.valves.CarbonContextCreatorValve.initCarbonContext(CarbonContextCreatorValve.java:80)
at org.wso2.carbon.tomcat.ext.valves.CarbonContextCreatorValve.invoke(CarbonContextCreatorValve.java:56)
at org.wso2.carbon.tomcat.ext.valves.RequestEncodingValve.invoke(RequestEncodingValve.java:49)
at org.wso2.carbon.tomcat.ext.valves.RequestCorrelationIdValve.invoke(RequestCorrelationIdValve.java:119)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1639)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834)
请让我知道如何解决此问题。