Bootstrap is served locally.

config.py

@@ -16,4 +16,6 @@ class Config(object):
     MAIL_USE_TLS = os.environ.get('MAIL_USE_TLS') is not None
     MAIL_USERNAME = os.environ.get('MAIL_USERNAME')
     MAIL_PASSWORD = os.environ.get('MAIL_PASSWORD')
-    ADMINS = ['your-email@example.com']
+    ADMINS = ['your-email@example.com']
+
+    BOOTSTRAP_SERVE_LOCAL = True