diff --git a/notification_client.md b/notification_client.md
index 17b0e63..b4bcf89 100644
--- a/notification_client.md
+++ b/notification_client.md
@@ -71,4 +71,16 @@ The notification looks like this (only with content).
 
 ![image](terraform/img/notification_iphone.png)
 
+## ERROR
+If you get this error:
+bash```
+...
+ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1006)
+...
+```
+
+Then go to Python Folder and execute Ìnstall Certificate.command`
+![image](terraform/img/certification_error.png)
+
+
 End Lab