[rules-users] Rule Task

Hello All I create a simple JBPM Process by Eclipse Plugin that starts with a Script Task and after Script Task i want to add a Rule Task. In fact i want to fire a rule in my process to make a decision on the Gate Way node. I use Guvnor and JBPM Console to run my processes and after designing the processes i upload them to Guvnor. My problem is : when i create a new instance of my process (in jbpm console) , first Script Task run fine , but execution of the process stops at Rule Task and no rule fired ! Am i missing something ? Any Help Appreciated S.M.H.Jamali