docs: update docs

docs/troubleshooting.md

@@ -1,6 +1,6 @@
 # Troubleshooting Guide
 
-### Common errors:
+### Common questions:
 
 ??? question "Admin Message: _**State Mismatched. Time expired?**_"
     This error occurs when the user is redirected to the Google login page and then returns to the Django login page but
@@ -35,6 +35,30 @@
     To see these errors please check the logs or enable the option `GOOGLE_SSO_SHOW_FAILED_LOGIN_MESSAGE` to see failed
     login messages on browser. Please, make note these messages can be used on exploit attacks.
 
+??? question "Got a "KeyError: 'NAME'" error after set SSO_USE_ALTERNATE_W003"
+    If you get a `KeyError: 'NAME'` error, please set a `NAME` in `TEMPLATES` at `settings.py`:
+
+    ```python
+    # settings.py
+
+    TEMPLATES = [
+        {
+            "BACKEND": "django.template.backends.django.DjangoTemplates",
+            "NAME" : "default",  # <-- Add name here
+            "DIRS": [BASE_DIR / "templates"],
+            "APP_DIRS": True,
+            "OPTIONS": {
+                "context_processors": [
+                    "django.template.context_processors.debug",
+                    "django.template.context_processors.request",
+                    "django.contrib.auth.context_processors.auth",
+                    "django.contrib.messages.context_processors.messages",
+                ],
+            },
+        },
+    ]
+    ```
+
 ### Example App
 
 To test this library please check the `Example App` provided [here](https://github.com/megalus/django-google-sso/tree/main/example_google_app).