diff -r f37b88d3edc6 -r 2295fdc5c271 canfestival/config_utils.py
--- a/canfestival/config_utils.py	Mon Nov 28 16:27:24 2016 +0300
+++ b/canfestival/config_utils.py	Mon Nov 28 16:47:01 2016 +0300
@@ -352,14 +352,16 @@
                 
                 # Check Id is in slave node list
                 if nodeid not in self.NodeList.SlaveNodes.keys():
-                    raise PDOmappingException, _("Non existing node ID : %d (variable %s)") % (nodeid,name)
+                    raise PDOmappingException, _("Non existing node ID : {a1} (variable {a2})").format(a1 = nodeid, a2 = name)
                 
                 # Get the model for this node (made from EDS)
                 node = self.NodeList.SlaveNodes[nodeid]["Node"]
                 
                 # Extract and check index and subindex
                 if not node.IsEntry(index, subindex):
-                    raise PDOmappingException, _("No such index/subindex (%x,%x) in ID : %d (variable %s)") % (index,subindex,nodeid,name)
+                    msg = _("No such index/subindex ({a1},{a2}) in ID : {a3} (variable {a4})").\
+                          format(a1 = "%x" % index, a2 ="%x" % subindex, a3 = nodeid, a4 = name)
+                    raise PDOmappingException, msg
                 
                 # Get the entry info
                 subentry_infos = node.GetSubentryInfos(index, subindex)
@@ -369,19 +371,23 @@
                     if sizelocation == "X" and len(loc) > 3:
                         numbit = loc[3]
                     elif sizelocation != "X" and len(loc) > 3:
-                        raise PDOmappingException, _("Cannot set bit offset for non bool '%s' variable (ID:%d,Idx:%x,sIdx:%x))") % (name,nodeid,index,subindex)
+                        msg = _("Cannot set bit offset for non bool '{a1}' variable (ID:{a2},Idx:{a3},sIdx:{a4}))").\
+                              format(a1 = name, a2 = nodeid, a3 = "%x" % index, a4 = "%x" % subindex)
+                        raise PDOmappingException, msg
                     else:
                         numbit = None
                     
                     if location["IEC_TYPE"] != "BOOL" and subentry_infos["type"] != COlocationtype:
-                        raise PDOmappingException, _("Invalid type \"%s\"-> %d != %d  for location\"%s\"") % (location["IEC_TYPE"], COlocationtype, subentry_infos["type"] , name)
+                        raise PDOmappingException, _("Invalid type \"{a1}\"-> {a2} != {a3}  for location\"{a4}\"").\
+                            format(a1 = location["IEC_TYPE"], a2 = COlocationtype, a3 = subentry_infos["type"] , a4 = name)
                     
                     typeinfos = node.GetEntryInfos(COlocationtype)
                     self.IECLocations[name] = {"type":COlocationtype, "pdotype":SlavePDOType[direction],
                                                 "nodeid": nodeid, "index": index,"subindex": subindex,
                                                 "bit": numbit, "size": typeinfos["size"], "sizelocation": sizelocation}
                 else:
-                    raise PDOmappingException, _("Not PDO mappable variable : '%s' (ID:%d,Idx:%x,sIdx:%x))") % (name,nodeid,index,subindex)
+                    raise PDOmappingException, _("Not PDO mappable variable : '{a1}' (ID:{a2},Idx:{a3},sIdx:{a4}))").\
+                        format(a1 = name, a2 = nodeid, a3 = "%x" % index, a4 = "%x" % subindex)
         
         #-------------------------------------------------------------------------------
         #                         Search for locations already mapped
@@ -630,12 +636,14 @@
             
             # Extract and check index and subindex
             if not slave.IsEntry(index, subindex):
-                raise PDOmappingException, _("No such index/subindex (%x,%x) (variable %s)") % (index, subindex, name)
+                raise PDOmappingException, _("No such index/subindex ({a1},{a2}) (variable {a3})").\
+                    format(a1 = "%x" % index, a2 = "%x" % subindex, a3 = name)
             
             # Get the entry info
             subentry_infos = slave.GetSubentryInfos(index, subindex)    
             if subentry_infos["type"] != COlocationtype:
-                raise PDOmappingException, _("Invalid type \"%s\"-> %d != %d  for location\"%s\"") % (location["IEC_TYPE"], COlocationtype, subentry_infos["type"] , name)
+                raise PDOmappingException, _("Invalid type \"{a1}\"-> {a2} != {a3} for location \"{a4}\"").\
+                    format( a1 = location["IEC_TYPE"], a2 = COlocationtype, a3 = subentry_infos["type"] , a4 = name)
             
             IECLocations[name] = COlocationtype
             pointers[(index, subindex)] = name