GGUFQuantizationConfig lives in diffusers.quantizers.quantization_config (0.33)

app.py

@@ -83,9 +83,10 @@ def _build_transformer(gguf_path: str):
     from diffusers import AutoModel
 
     try:
+        # diffusers 0.33.x (pinned): GGUF config lives under quantizers.
+        from diffusers.quantizers.quantization_config import GGUFQuantizationConfig
+    except ImportError:  # later versions re-export it from diffusers.utils
         from diffusers.utils import GGUFQuantizationConfig
-    except ImportError:  # newer diffusers moved it under utils.quantization_config
-        from diffusers.utils.quantization_config import GGUFQuantizationConfig
 
     kwargs = dict(
         quantization_config=GGUFQuantizationConfig(compute_dtype=torch.bfloat16),