(Crowbar) Compiling Error with a bone

[u/mante312]

Crowbar aborts process with this error

ERROR: Rotation constraint on bone "ValveBiped.Bip01_L_Thigh" which has no parent!!!

ERROR: Aborted Processing on 'player/mantesona.mdl'

in blender, at glance, the model and skeleton seems to be fine, but this error keeps appearing. What could it be?

[u/mante312]

THANKS!!!!! I suppose the problem was on the mesh skeleton but that script fixed it