--- calo/flight/FQLOOK/macros/FCaloQLOOK.cxx	2006/03/09 16:14:32	1.1
+++ calo/flight/FQLOOK/macros/FCaloQLOOK.cxx	2006/03/13 09:01:23	1.2
@@ -25,6 +25,7 @@
 #include <TPad.h>
 #include <TPolyLine.h>
 #include <TStyle.h>
+#include <TSystem.h>
 //
 #include <event/PamelaRun.h>
 #include <event/physics/calorimeter/CalorimeterEvent.h>
@@ -72,13 +73,18 @@
   ifstream myfile;
   myfile.open(filename.Data());
   if ( !myfile ){
-    printf(" No such file, exiting...\n");
+    printf(" %s :no such file, exiting...\n\n",filename.Data());
     return;
   };
   myfile.close();
   //
   TFile *File = new TFile(filename.Data());
   TTree *tr = (TTree*)File->Get("Physics");
+  if ( !tr ) {
+    printf(" Physics : no such tree in %s \n",filename.Data());
+    printf(" Exiting, are you sure this is a LEVEL0 not corrupted file? \n\n");
+    return;
+  };
   //
   // Define variables
   //