update error file not found Parse Mapping

cdplib/db_migration/ParseMapping.py

@@ -22,10 +22,10 @@ class ParseMapping:
         import json
         from cdplib.log import Log
 
-        self.log = Log('Parse Mapping')
+        self._log = Log('Parse Mapping')
 
         if not os.path.isfile(mapping_path):
-            err = "Mapping not found"
+            err = "Mapping not found "+mapping_path
             self._log.error(err)
             raise FileNotFoundError(err)
 
@@ -34,7 +34,7 @@ class ParseMapping:
                 self._mapping = json.load(f)
 
         except Exception as e:
-            err = ("Could not load mapping. "
+            err = ("Could not load mapping. " + mapping_path +
                    "Exit with error {}".format(e))
             self._log.error(err)
             raise Exception(err)