V 1.5.6 nightly issue - RuntimeError: Expected all tensors to be on the same device....

[Kentskooking]

Seems 1.5.6 nightly was throwing this error anytime it hit the Ksampler.

RuntimeError: Expected all tensors to be on the same device, but found at least two devices, cpu and cuda:0! (when checking argument for argument mat2 in method wrapper_CUDA_mm)

I had animatediff in the pipeline as well, not sure if that matters but I didn't test thoroughly.

Rolling back to 1.5.5 fixed the issue

This was with portable comfy and manager versions below

ComfyUI: v0.3.49
(2025-08-05)
Manager: V3.32.5

[Kosinkadink]

You may need to update ComfyUI - version 1.5.6 fixes more tensors issues, it shouldn't break anything.

Just in case, can you post a screenshot of the workflow (or the workflow itself)?

[adrian-gierakowski]

same issue here,
Advanced-ControlNet: da254b7 (from march)
ComfyUI: 0.3.57 (2025-09-06)

minimal repro (workflow embedded)

[adrian-gierakowski]

updating Advanced-ControlNet fixed it as stated here

[hyupuunos]

​Join the club

[Kosinkadink]

Make sure you actually update - if there is a random issue with your local files being edited, git may not automatically pull (unrelated to my code). In which case, simply uninstall and install the node pack and all will be well. And if you still experience after that, post the full error stack and i can take a look!