Could not connect task client

Just after logging in the BPM console, it sends me to http://localhost:8080/gwt-console/app.html#errai_ToolSet_Tasks;none and shows a "Could not connect task client" error and a stacktrace.

• URL: 'http://localhost:8080/gwt-console-server/rs/tasks/admin'
• Action: 'org.jboss.bpm.console.client.task.LoadTasksAction'
• Exception: 'class com.google.gwt.http.client.RequestException'

HTTP 500:
Estado HTTP 500 -

type Informe de Excepción

mensaje

descripción El servidor encontró un error interno () que hizo que no pudiera rellenar este requerimiento. (The server encountered an internal error that prevented it to fulfiill this requirement)

excepción

org.jboss.resteasy.spi.UnhandledException: java.lang.IllegalArgumentException: Could not connect task client
org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:319)
org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:230)
org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:206)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:360)
org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:173)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:93)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:68)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

causa raíz

java.lang.IllegalArgumentException: Could not connect task client
org.drools.integration.console.DroolsFlowTaskManagement.connect(DroolsFlowTaskManagement.java:59)
org.drools.integration.console.DroolsFlowTaskManagement.getAssignedTasks(DroolsFlowTaskManagement.java:128)
org.jboss.bpm.console.server.TaskListFacade.getTasksForIdRef(TaskListFacade.java:99)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:117)
org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:260