Internal Server Error: /admin/snippets/puput/category/add/

[tamhv]

Django==3.2.12
wagtail==2.15.4
puput==1.1.3

#settings
DEBUG  = False
STATICFILES_STORAGE = 'myproject.utils.CustomManifestStaticFilesStorage'

Puput is working, i created a first blog page, all good, nothing wrong but when i navigate to /admin/snippets/puput/category/add/ i got 500 Internal server error.

ERROR [django.request:224] Internal Server Error: /admin/snippets/puput/category/add/
Traceback (most recent call last):
  File "/Users/myname/demo/wagtail/virtenv/lib/python3.9/site-packages/django/contrib/staticfiles/storage.py", line 88, in hashed_name
    raise ValueError("The file '%s' could not be found with %r." % (filename, self))
ValueError: The file 'wagtailadmin/css/panels/rich-text.css' could not be found with <myproject.utils.CustomManifestStaticFilesStorage object at 0x7f96ac695fd0>.

#utils.py
class CustomManifestStaticFilesStorage(ManifestStaticFilesStorage):
    manifest_strict = False

And i've tried manifest_strict = False, still no luck.