read the error: anonymous wrote : | Caused by: org.jbpm.identity.assignment.ExpressionAssignmentException: couldn't resolve assignment expression 'user(Aari | f)' | at org.jbpm.identity.assignment.ExpressionAssignmentHandler.assign(ExpressionAssignmentHandler.java:104) | at org.jbpm.taskmgmt.exe.TaskMgmtInstance.performAssignmentDelegation(TaskMgmtInstance.java:259) | at org.jbpm.taskmgmt.exe.TaskMgmtInstance.performAssignment(TaskMgmtInstance.java:228) | ... 69 more | Caused by: java.lang.NullPointerException | at org.jbpm.identity.hibernate.IdentitySession.getUserByName(IdentitySession.java:168) | at org.jbpm.identity.assignment.ExpressionAssignmentHandler.getUserByName(ExpressionAssignmentHandler.java:226) | at org.jbpm.identity.assignment.ExpressionAssignmentHandler.resolveFirstTerm(ExpressionAssignmentHandler.java:15 | 6) | at org.jbpm.identity.assignment.ExpressionAssignmentHandler.assign(ExpressionAssignmentHandler.java:80) | The assignment does not return a known user, most likely your user Aarif is not in the userdatabase View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4050941#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...