The previous problem has disappeared after I changed my jbpm.cgf.xml like this: | <?xml version="1.0" encoding="UTF-8"?> | | <jbpm-configuration xmlns="http://jbpm.org/xsd/cfg"> | | | <process-engine-context> | | <repository-service /> | <repository-cache /> | <execution-service /> | <history-service /> | <management-service /> | <identity-service /> | <task-service /> | | | <string name="jbpm.duedatetime.format" value="HH:mm dd/MM/yyyy" /> | .... | But now I am getting another exception: 13:13:51,115 INF | [DefaultCommandService] exception while executing command org.jbpm.pvm.internal.cmd.SignalCmd@c940c94 org.jbpm.api.JbpmException: text is null at org.jbpm.pvm.internal.cal.Duration.(Duration.java:77) at org.jbpm.pvm.internal.job.TimerImpl.setDueDateDescription(TimerImpl.java:78) at org.jbpm.pvm.internal.model.ScopeInstanceImpl.createTimer(ScopeInstanceImpl.java:294) at org.jbpm.pvm.internal.model.ScopeInstanceImpl.initializeTimers(ScopeInstanceImpl.java: View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4249390#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...