diff --git a/source/app/controllers/cfdi_cert.py b/source/app/controllers/cfdi_cert.py
index 49b72dd..295711b 100644
--- a/source/app/controllers/cfdi_cert.py
+++ b/source/app/controllers/cfdi_cert.py
@@ -16,7 +16,11 @@ from cryptography.hazmat.primitives import hashes
 from cryptography.hazmat.primitives.asymmetric import padding
 
 
-from .conf import TOKEN
+try:
+    from .conf import TOKEN
+except ImportError:
+    TOKEN = ''
+    print('Agrega el TOKEN al archivo conf.py, obligatorio en v1.41.0')
 
 
 class SATCertificate(object):