Please see attached project where I am trying to get the closing prices for all symbols selected by Universal Selection for a given date.

The final log is this: 

s="A",p=77.95 s="AA",p=14.50 s="AAL",p=0 s="AAN",p=0 ..........

As you can see, "AAL" & "AAN" closing prices I try to get are showing 0. There are many more symbols showing 0 down the list in the log.

How could they be 0? It means some symbols' "OnData" is never called for that trading day in back testing?

Did I do anything wrong here? Please help.