ARTv1 "Target list was empty or contained no valid targets."

Development Pipeline & Plugins
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I’m trying to make “Deformation Setup”. Last time nothing, now this. I tried with old skeleton, it gives the same error. I’m panicking, can anyone tell me what to do?

Maya gives this error:

“Traceback (most recent call last):
File “C:/pathpathpath/Scripts\ART_skeletonBuilder_UI.py”, line 6759, in skinProxyGeo_UI_Cancel
self.lock_phase2(deleteProxy, False)
File “C:/pathpathpath/Scripts\ART_skeletonBuilder_UI.py”, line 6959, in lock_phase2
constraint = cmds.parentConstraint(lra, jointName)[0]
RuntimeError: Target list was empty or contained no valid targets.”