# System checks

The following system checks help verify the Django Debug Toolbar setup and configuration:

- debug_toolbar.W001: `debug_toolbar.middleware.DebugToolbarMiddleware` is missing from `MIDDLEWARE`.

- debug_toolbar.W002: `debug_toolbar.middleware.DebugToolbarMiddleware` occurs multiple times in `MIDDLEWARE`.

- debug_toolbar.W003: `debug_toolbar.middleware.DebugToolbarMiddleware` occurs before `django.middleware.gzip.GZipMiddleware` in `MIDDLEWARE`.

- debug_toolbar.W004: `debug_toolbar` is incompatible with `MIDDLEWARE_CLASSES` setting.

- debug_toolbar.W005: Setting `DEBUG_TOOLBAR_PANELS` is empty.