diff --git a/ippisite/ippidb/management/commands/update_mrc_files.py b/ippisite/ippidb/management/commands/update_mrc_files.py
index 723b0a3184676c2c8ecf8090c43355012be21431..be8c4b759b60585642ce457f994dfd72ef68865c 100644
--- a/ippisite/ippidb/management/commands/update_mrc_files.py
+++ b/ippisite/ippidb/management/commands/update_mrc_files.py
@@ -23,9 +23,9 @@ def isolevel_float(arg):
     try:
         f = float(arg)
     except ValueError:
-        raise argparse.ArgumentTypeError("Must be a floating point number")
+        raise CommandError("Must be a floating point number")
     if f < 0 or f > 1.0:
-        raise argparse.ArgumentTypeError("Argument must be < 1.0 and > 0")
+        raise CommandError("Argument must be < 1.0 and > 0")
     return f
 
 
@@ -147,7 +147,7 @@ class Command(AppCommand):
                     with open(data, "rb") as f:
                         interactfile.interact_file.delete()
                         interactfile.interact_file.save(os.path.basename(data), File(f))
-                    interactfile.default_isolevel=options["default_isolevel"]
+                    interactfile.default_isolevel = options["default_isolevel"]
                     interactfile.save()
                 self.stdout.write(
                     self.style.SUCCESS(