Description of problem: blank screen while opening guided editor rule

Version-Release number of selected component (if applicable):6.0.3

How reproducible:

Steps to Reproduce:
1. created rule using guided editor
2. added consequence using "freeform drl" - refer actual rule below
3. saved and closed the editor.
4. try to open the same rule.

Actual results:
when I tried to open the rule on the editor shows blank screen

Expected results:
Supposed open actual rule in guided editor

Additional info:

rule "AgentBooking Rule"
dialect "mvel"
when
agent : Agent( )
currentDate : TransactionDate( )
Number( eval( intValue >=2 )) from accumulate ( resEvent : ReservationEvent( agentId == agent.agentId , resdate == currentDate.eventDate ) from entry-point "reservationEvent"
,
count(resEvent))
then
ReservationThresoldEvent thresoldevent = new ReservationThresoldEvent();
thresoldevent.setAgentId( agent.getAgentId() );
thresoldevent.setTxEventDate( currentDate.getEventDate() );
kcontext.getKnowledgeRuntime().getEntryPoint("reservationTraceEvent").insert( thresoldevent );
end