add expression robot to get objects in promotion notice

Initially posted in this topic

I tried to do the same thing with Windchill 12.0.2.0, but I get the following error with the code in order to add expression robot to get objects in promotion notice :

Expression :

wt.fc.QueryResult promotables = wt.maturity.MaturityHelper.service.getPromotionTargets((wt.maturity.PromotionNotice)primaryBusinessObject);
promObjList = new ArrayList<String>();

while(promotables.hasMoreElements()){
	wt.fc.WTObject promotable = (wt.fc.WTObject) promotables.nextElement();
	promObjList.add(promotable.getDisplayIdentity());
}

error :

Checking Syntax...
WfExpression_158100.java:55: error: cannot find symbol
promObjList = new ArrayList<String>();
^
 symbol: variable promObjList
 location: class WfExpression_158100
WfExpression_158100.java:59: error: cannot find symbol
	promObjList.add(promotable.getDisplayIdentity());
	^
 symbol: variable promObjList
 location: class WfExpression_158100
Note: WfExpression_158100.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: WfExpression_158100.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
2 errors

Syntax check complete.
​

does anyone know how to fix the problem?