客户端频繁退出

客户端使用的时候总是频繁的退出，一两分钟不操作就自动退出，而且还出现如图提示。不重新启动客户端就无法登陆。

--------------------ExW您可能使用的是无效的许可文件，或者您的软件唯一码有变化，请重新申请许可文件！
Collection was modifierapperInnerException--------------------
无法加载许可文件！d; enumeration operation may not execute.
at Kingdee.BOS.ServiceHelper.DataCenterService.GetLangList(Context ctx)
at Kingdee.BOS.ServiceFacade.ServicesStub.Account.AccountService.GetDataCenterLoginLanguages(String dbId, DatabaseType dbType, String clientLCName)

--------------------ExWrapperException--------------------
Exception has been thrown by the target of an invocation.
at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Kingdee.BOS.ServiceFacade.KDServiceFx.ServiceExecutor.Execute(KDServiceContext context, ServiceType svcType, String[] paraValues, SerializerProxy serializeProxy, ServiceType beginMethod)

--------------------Exception--------------------
无法加载许可文件！您可能使用的是无效的许可文件，或者您的软件唯一码有变化，请重新申请许可文件！
Collection was modified; enumeration operation may not execute.
在 Kingdee.BOS.ServiceFacade.KDServiceClient.KDServiceClient.ParseException(String message, Encoding encoding, MessageFormats format)
在 Kingdee.BOS.ServiceFacade.KDServiceClient.KDServiceClient.GetResponseContent(HttpWebResponse rsp, KDBaseRequest kdrequest)
在 Kingdee.BOS.ServiceFacade.KDServiceClient.KDServiceClient.GetResponseCallback(IAsyncResult result, KDBaseRequest kdrequest, Action`1 callback)