update documentation

ZEROGPU_MIGRATION.md

@@ -274,6 +274,23 @@ def generate_scene(...):
 - Verify HuggingFace access
 - Manually download and specify with `--ckpt` flag
 
+### "Error building extension 'gsplat_cuda'" or "glm/gtc/type_ptr.hpp: No such file or directory"
+
+**Cause:** Missing GLM library headers required for gsplat CUDA compilation
+
+**Solutions:**
+- Ensure `packages.txt` exists with `libglm-dev` and `build-essential`
+- Restart the Space to reinstall dependencies
+- Check Space build logs for system package installation errors
+
+### "Bias is not supported when out_dtype is set to Float32"
+
+**Cause:** PyTorch FP8 operations limitation on certain GPU architectures
+
+**Solutions:**
+- This is fixed in `quant.py` by applying bias separately when needed
+- Ensure you have the latest version of the code
+
 ## Future Improvements
 
 Potential enhancements for ZeroGPU deployment: