update

app/apps.py

@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class MainConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "app"

main/apps.py

@@ -1,6 +0,0 @@
-from django.apps import AppConfig
-
-
-class MainConfig(AppConfig):
-    default_auto_field = 'django.db.models.BigAutoField'
-    name = 'main'

student_management_system/settings.py

@@ -38,7 +38,7 @@ INSTALLED_APPS = [
     "django.contrib.sessions",
     "django.contrib.messages",
     "django.contrib.staticfiles",
-    "main",
+    "app",
 ]
 
 MIDDLEWARE = [