diff --git a/core/models.py b/core/models.py
index 557776c2..843a708c 100644
--- a/core/models.py
+++ b/core/models.py
@@ -1,6 +1,7 @@
 # core/models.py
 from django.db import models
 from django.utils.text import slugify
+from django.core.exceptions import ValidationError
 
 
 class UserAgent(models.Model):