[ERROR] exception can't create a process instance when proce

[mehdi_swatch]

hi everybody,

when I want to create a process with :

 JbpmConfiguration jbpmconfiguration = JbpmConfiguration.getInstance();
 JbpmContext jbpmContext = jbpmconfiguration.createJbpmContext();
 try {
ProcessInstance processInstance = jbpmContext.newProcessInstance("WorkflowNode");
 }finally{
 jbpmContext.close();
 }

hi give error :
exception can't create a process instance when processDefinition is null.

thanks for your help.