Error in display Security/Keystore

Hello,
When have configured both keystore and trustestore in our IS, but since a couple of weeks we got an error when we click on Security/keystore:
does anybody got this error?

wm.server.security.keystore:listKeyStores:

java.lang.NullPointerException: null
at com.wm.security.keystore.ISKeyStoreManager.getStoreAsIData(ISKeyStoreManager.java:740)
at com.wm.security.keystore.ISKeyStoreManager.listKeyStoresAsIDataList(ISKeyStoreManager.java:845)
at wm.server.securityimpl.listKeyStores(securityimpl.java:196)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.wm.app.b2b.server.JavaService.baseInvoke(JavaService.java:449)
at com.wm.app.b2b.server.invoke.InvokeManager.process(InvokeManager.java:643)
at com.wm.app.b2b.server.util.tspace.ReservationProcessor.process(ReservationProcessor.java:46)
at com.wm.app.b2b.server.invoke.StatisticsProcessor.process(StatisticsProcessor.java:44)
at com.wm.app.b2b.server.invoke.ServiceCompletionImpl.process(ServiceCompletionImpl.java:243)
at com.wm.app.b2b.server.invoke.ValidateProcessor.process(ValidateProcessor.java:51)
at com.wm.app.b2b.server.invoke.PipelineProcessor.process(PipelineProcessor.java:171)
at com.wm.app.b2b.server.ACLManager.process(ACLManager.java:276)
at com.wm.app.b2b.server.invoke.DispatchProcessor.process(DispatchProcessor.java:30)
at com.wm.app.b2b.server.AuditLogManager.process(AuditLogManager.java:363)
at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:547)
at com.wm.app.b2b.server.invoke.InvokeManager.invoke(InvokeManager.java:386)
at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java:234)
at com.wm.app.b2b.server.ServiceManager.invoke(ServiceManager.java:109)
at com.wm.app.b2b.server.ns.Namespace.invoke(Namespace.java:577)
at com.wm.util.template.Reporter.invoke(Reporter.java:964)
at com.wm.util.template.InvokeToken.eval(InvokeToken.java:75)
at com.wm.util.template.TemplateToken.evalChild(TemplateToken.java:234)
at com…

solved:
there was a wrong keystore config file in IntegrationServer/config/security/keystore,
deleting it and restart IS