Multiscale Gradient Correction: Nor reference Data found

Hello,
I tried to follow the video for "Multiscale Gradient Correction" but cant get it to work on RGB or mono frames (same error message).
Hopefully it is something i am missing and you can help me.
Please see the attached screenshot for the error message and the settings i am Using

CS Detlef
Screenshot_20250103_155540.jpg
5120 x 1440 - 1M

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