OpenposePreprocessor - No module named 'skimage'

[Hurricane190]

Im having Problems with the Controlnet Proprecessor and OpenPose Preprocessor. Both say "No module named 'skimage'" and I have no Idea what that means. Does anyone know how to fix that?

File "D:\ComfyUI_windows_portable\ComfyUI\custom_nodes\comfyui_controlnet_aux\src\custom_controlnet_aux\open_pose\hand.py", line 5, in
from skimage.measure import label
ModuleNotFoundError: No module named 'skimage'