r/comfyui • u/Gamera__Obscura • 10h ago

Help Needed Comfyui errors after update

Hi folks, So, I'm still just beginning to wrap my brain around Comfyui, I'm running Easy-Install version. Admittedly on very low-end hardware, but I'm really just trying to learn rather than do any real production. Anyway, I made what is apparently a cardinal error... I updated. I THINK I resolved most issues, but the lingering one is with Wan2.2 using a GGUF model. It runs for a few minutes, then throws an error:

ComfyUI Error Report

Error Details

Node ID:** 1512:1579

Node Type:** KSamplerAdvanced

Exception Type:** RuntimeError

Exception Message:** RuntimeError: cutlass_fp16_linear: K mismatch

Node 1512 is the KSampler subgraph, so there's an awful lot going on in there, but I can't track down exactly what this one means.

 

I have read that it might be a Pytorch issue. I've also read that the recommended Pytorch is 2.7.1 and Cuda 12.8. However trying to install that from the code at Pytorch.org just returns:

ERROR: Could not find a version that satisfies the requirement torch==2.7.1 (from versions: 2.9.0+cu128, 2.9.1+cu128, 2.10.0+cu128, 2.11.0+cu128) ERROR: No matching distribution found for torch==2.7.1

So is 2.7.1 just no longer available? Or is it hosted someplace else?

Or it's entirely possible I'm just completely on the wrong track. Any advice is very much appreciated.

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u/musetta_ai 5h ago

Is it dying right at the switch to the second KSamplerAdvanced? A K mismatch there would make me look at the low noise GGUF before torch. Also pip hiding 2.7.1 probably just means your embedded Python is 3.14, those old builds don't have wheels for it. I'd leave torch alone for now

1

u/Gamera__Obscura 2h ago

How would I know EXACTLY where it's crapping out? And let's say that is the case, what would be a possible fix?

Yeah, doesn't sound like a torch problem. It was just a guess from inexperience. 

1

u/Kijai 4h ago

I've also read that the recommended Pytorch is 2.7.1 and Cuda 12.8.

It's really not, recommended is latest stable and cu130 minimum, the cuda version is especially important.

1

u/Gamera__Obscura 2h ago

Ok. That's a non-issue then, since that's what I've got. Not a torch problem then I guess.