diff --git a/backend/core/settings/base.py b/backend/core/settings/base.py
index 397f615..c05a736 100644
--- a/backend/core/settings/base.py
+++ b/backend/core/settings/base.py
@@ -257,4 +257,9 @@ AZ_IRANIAN_BANK_GATEWAYS = {
     ],  
     "IS_SAFE_GET_GATEWAY_PAYMENT": True  # better to be True
 }
-DEFAULT_TAX_RATE = 20
\ No newline at end of file
+DEFAULT_TAX_RATE = 20
+
+
+HANDLER403 = "core.views.custom_permission_denied"
+HANDLER404 = 'core.views.handler404'
+HANDLER500 = 'core.views.handler500'
\ No newline at end of file