⚠️ Model Troubleshooting Guide
How to Fix "Expected 4 channels in latent, got 16" in ComfyUI
Resolving latent space dimension conflicts between SD 1.5, SDXL, and FLUX.1 models.
Error Signature:
ValueError: Expected 4 channels in latent, got 16⚡ Quick Direct Answer
Ensure you are pairing FLUX checkpoints with the FLUX VAE (`ae.safetensors`) and the Empty FLUX Latent Image node, not standard Empty Latent Image.
Why Does This Error Happen?
You connected a 16-channel FLUX latent image or FLUX VAE into an SD1.5 or SDXL sampler/VAE designed for standard 4-channel latents.
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Frequently Asked Questions
Why does FLUX use 16 channels while SDXL uses 4?
FLUX.1 is a 12B parameter flow-matching transformer with a 16-channel VAE architecture that compresses latents differently from traditional 4-channel Stable Diffusion autoencoders.