MHX snapping IK to FK or vice versa results in script error

[Jason Love]

Using MHX 1.7.3.0104, Blender 4.02, EndeavourOS (6.1.68-1-lts). Snapping IK to FK or vice versa for either legs, arms or the Snap FK/IK All buttons result in a script error with the following Python traceback:

Python: Traceback (most recent call last):
  File "/home/jovub/.config/blender/4.0/scripts/addons/Diffeomorphic-mhx_rts-81baade08add/utils.py", line 206, in execute
    self.prequel(context)
  File "/home/jovub/.config/blender/4.0/scripts/addons/Diffeomorphic-mhx_rts-81baade08add/fkik.py", line 146, in prequel
    HideOperator.prequel(self, context)
  File "/home/jovub/.config/blender/4.0/scripts/addons/Diffeomorphic-mhx_rts-81baade08add/utils.py", line 260, in prequel
    coll = self.rig.data.collections[cname]
           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
KeyError: 'bpy_prop_collection[key]: key "Root" not found'

Using MHX 1.7.0.0073 this results in a different traceback:

Python: Traceback (most recent call last):
  File "/home/jovub/.config/blender/4.0/scripts/addons/mhx_rts/utils.py", line 193, in execute
    self.prequel(context)
  File "/home/jovub/.config/blender/4.0/scripts/addons/mhx_rts/fkik.py", line 146, in prequel
    HideOperator.prequel(self, context)
  File "/home/jovub/.config/blender/4.0/scripts/addons/mhx_rts/utils.py", line 241, in prequel
    self.state = list(self.rig.data.layers)
                      ^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Armature' object has no attribute 'layers'

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[Alessandro Padovani]

windows 10, blender 4.0.2, diffeomorphic 1.7.3.1953, mhx 1.7.3.0104

Here the error is slightly different but yes I can confirm the issue under win10 too.

steps:

1. import G8F and convert to MHX
2. pose one leg with IK and snap FK all

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[Thomas Larsson]

Fixed in last commit (the bugs in 1.7.3). Version 1.7.0 is not compatible with Blender 4 at all.

[Alessandro Padovani]

Commit ab8d2c3 with mhx 116a0af works fine here, thank you for the fix. If Jason has nothing to add we can close as resolved.

[Jason Love]

Latest commit fixed it here as well, thanks.