krita-ai-diffusion Server error: [Errno 22] Invalid argument

connection is green models no missing I use "Custom Server" option but does not work

Aug 21 '25 14:08 mdkid79

You need to check your server output for what the problem is and probably fix it there.

Aug 21 '25 20:08 Acly

You need to check your server output for what the problem is and probably fix it there.

you mean comfyui ? sorry, I'm not a coder so I don't know what is the "server output" and how to fix it would you mind tell me more details like where I can find the "server output" , thanks

Aug 22 '25 06:08 mdkid79

TL;DR: I found the problem and how to solve it.

Close Krita and ComfyUI
Open the Task Manager and terminate all Python processes.
Go to Documents/ComfyUI/user
Delete all the .log files in there
Start Krita
Start ComfyUI and connect the plugin with it.

That's how I got my custom SDXL models working.

Long story

I got the same error as the OP. As suggested by the owner, I went through the latest ComfyUI logs (in Documents/ComfyUI/user) and found out that every time I hit "generate" from Krita, it printed out this:

[2025-12-09 11:04:50.558] got prompt
[2025-12-09 11:04:50.564] --- Logging error ---
[2025-12-09 11:04:50.564] !!! Exception during processing !!! [Errno 22] Invalid argument
[2025-12-09 11:04:50.565] --- Logging error ---
[2025-12-09 11:04:50.565] Traceback (most recent call last):
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\execution.py", line 510, in execute
    output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\execution.py", line 324, in get_output_data
    return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, hidden_inputs=hidden_inputs)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\execution.py", line 298, in _async_map_node_over_list
    await process_inputs(input_dict, i)
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\execution.py", line 286, in process_inputs
    result = f(**inputs)
             ^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy_api\internal\__init__.py", line 149, in wrapped_func
    return method(locked_class, **inputs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy_api\latest\_io.py", line 1275, in EXECUTE_NORMALIZED
    to_return = cls.execute(*args, **kwargs)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy_extras\nodes_custom_sampler.py", line 911, in execute
    samples = guider.sample(noise.generate_noise(latent), latent_image, sampler, sigmas, denoise_mask=noise_mask, callback=callback, disable_pbar=disable_pbar, seed=noise.seed)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy\samplers.py", line 1035, in sample
    output = executor.execute(noise, latent_image, sampler, sigmas, denoise_mask, callback, disable_pbar, seed, latent_shapes=latent_shapes)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy\patcher_extension.py", line 112, in execute
    return self.original(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy\samplers.py", line 997, in outer_sample
    output = self.inner_sample(noise, latent_image, device, sampler, sigmas, denoise_mask, callback, disable_pbar, seed, latent_shapes=latent_shapes)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy\samplers.py", line 980, in inner_sample
    samples = executor.execute(self, sigmas, extra_args, callback, noise, latent_image, denoise_mask, disable_pbar)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy\patcher_extension.py", line 112, in execute
    return self.original(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy\samplers.py", line 752, in sample
    samples = self.sampler_function(model_k, noise, sigmas, extra_args=extra_args, callback=k_callback, disable=disable_pbar, **self.extra_options)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\Documents\ComfyUI\.venv\Lib\site-packages\torch\utils\_contextlib.py", line 116, in decorate_context
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\comfy\k_diffusion\sampling.py", line 794, in sample_dpmpp_2m
    for i in trange(len(sigmas) - 1, disable=disable):
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\Documents\ComfyUI\.venv\Lib\site-packages\tqdm\auto.py", line 37, in trange
    return tqdm(range(*args), **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\Documents\ComfyUI\.venv\Lib\site-packages\tqdm\asyncio.py", line 24, in __init__
    super().__init__(iterable, *args, **kwargs)
  File "C:\Users\Username\Documents\ComfyUI\.venv\Lib\site-packages\tqdm\std.py", line 1096, in __init__
    self.sp = self.status_printer(self.fp)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Username\Documents\ComfyUI\.venv\Lib\site-packages\tqdm\std.py", line 448, in status_printer
    getattr(sys.stderr, 'flush', lambda: None)()
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\custom_nodes\ComfyUI-Manager\prestartup_script.py", line 368, in flush
    original_stderr.flush()
  File "C:\Users\Username\AppData\Local\Programs\@comfyorgcomfyui-electron\resources\ComfyUI\app\logger.py", line 35, in flush
    super().flush()
OSError: [Errno 22] Invalid argument

[2025-12-09 11:04:50.567] --- Logging error ---
[2025-12-09 11:04:50.567] Prompt executed in 0.01 seconds
[2025-12-09 11:04:50.860] Exception ignored in: Exception ignored in sys.unraisablehook

I asked Grok about it and told me to remove the logs.

Ever since I've done that:

ComfyUI logged with less log clutter on startup (there used to be initialization errors but they didn't seem critical in any capacity).
Krita AI can generate successfully.

Dec 09 '25 10:12 cybernaut4