Problem converting ckpt to onnx files and can we use extensions like Controlnet?

[Winnougan]

I installed Stable Diffusion 1.5 and followed the instructions, however, when I tried to convert the "ckpt" file to the "diffusers" file, I got this error:

(virtualenv) D:\Stable>python convert_original_stable_diffusion_to_diffusers.py --checkpoint_path="./dreamlikeDiffusion10_10.ckpt" --dump_path="./dreamlikeDiffusion10_10_diffusers"
Traceback (most recent call last):
  File "D:\Stable\convert_original_stable_diffusion_to_diffusers.py", line 103, in <module>
    pipe = load_pipeline_from_original_stable_diffusion_ckpt(
  File "D:\Stable\virtualenv\lib\site-packages\diffusers\pipelines\stable_diffusion\convert_from_ckpt.py", line 881, in load_pipeline_from_original_stable_diffusion_ckpt
    original_config = OmegaConf.load(original_config_file)
  File "D:\Stable\virtualenv\lib\site-packages\omegaconf\omegaconf.py", line 189, in load
    with io.open(os.path.abspath(file_), "r", encoding="utf-8") as f:
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\Rigger\\AppData\\Local\\Temp\\tmps4xa2izm\\inferenc.yaml'

My second question is, can we install extensions like Controlnet? I don't see any place to put them?