Error4 reports
Fix NotImplementedError
in Diffusers
✅ Solution
The "NotImplementedError" often arises when attempting to load specific model types or configurations (like meta tensors) with a method that lacks the necessary implementation. To resolve this, either use the correct loading function tailored for the specific model format (e.g., safetensors), ensure all required dependencies are installed, or explicitly move the model to the target device after loading. If loading GGUF, verify that the loading script is specifically designed to handle that format.
Related Issues
Real GitHub issues where developers encountered this error:
z-image-turbo from_single_file errorsDec 24, 2025
how to use quantization and device_map=balance to run qwen-image on kaggle T4 * 2Nov 26, 2025
WanTransformer3DModel.from_single_file wont load Wan2.2 GGUF (NotImplementedError: Cannot copy out of meta tensor; no data)Jul 29, 2025
Cannot copy out of meta tensor; no data! Please use torch.nn.Module.to_empty() instead of torch.nn.Module.to() when moving module from meta to a different device.Jul 28, 2025
Timeline
First reported:Jul 28, 2025
Last reported:Dec 24, 2025