check path corectly

Author: SunMarc

src/diffusers/configuration_utils.py

@@ -361,10 +361,11 @@ def load_config(
             )
         # Custom path for now
         if dduf_entries:
+            # paths inside a DDUF file must always be "/"
             if subfolder is not None:
-                config_file = os.path.join(pretrained_model_name_or_path, subfolder, cls.config_name)
+                config_file = "/".join([pretrained_model_name_or_path, subfolder, cls.config_name])
             else:
-                config_file = os.path.join(pretrained_model_name_or_path, cls.config_name)
+                config_file = "/".join([pretrained_model_name_or_path, cls.config_name])
             if config_file not in dduf_entries:
                 raise ValueError(
                     f"We did not manage to find the file {config_file} in the dduf file. We only have the following files {dduf_entries.keys()}"