MetaHuman for Maya - Unable to use ML joints matching (v1.2.50)

Development Character & Animation
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1

I running into a RuntimeError when trying to use the ML joints matching operation within the expression editor (either for an individual pose or for the scene). The traceback I’m encountering can be found below. This is in Maya 2026.3 and using the 1.2.50 version of MetaHuman for Maya plugin.

# Traceback (most recent call last):
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\mh_expression_editor\1.12.7\mh_expression_editor\window.py", line 1692, in on_run_ml_joints_matching_in_scene_clicked
#     self.controller.run_ml_joints_matching_in_scene(
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\mh_expression_editor\1.12.7\mh_expression_editor\control.py", line 27, in wrapper_with_args
#     raise e
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\mh_expression_editor\1.12.7\mh_expression_editor\control.py", line 24, in wrapper_with_args
#     return function(*args, **kwargs)
#            ^^^^^^^^^^^^^^^^^^^^^^^^^
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\mh_expression_editor\1.12.7\mh_expression_editor\control.py", line 461, in run_ml_joints_matching_in_scene
#     self._run_ml_joints_matching_in_scene(rig, mutable_joints)
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\mh_expression_editor\1.12.7\mh_expression_editor\control.py", line 27, in wrapper_with_args
#     raise e
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\mh_expression_editor\1.12.7\mh_expression_editor\control.py", line 24, in wrapper_with_args
#     return function(*args, **kwargs)
#            ^^^^^^^^^^^^^^^^^^^^^^^^^
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\mh_expression_editor\1.12.7\mh_expression_editor\control.py", line 425, in _run_ml_joints_matching_in_scene
#     result, skinning_joints = self.match_joints_in_scene(
#                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\mh_expression_editor\1.12.7\mh_expression_editor\control.py", line 27, in wrapper_with_args
#     raise e
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\mh_expression_editor\1.12.7\mh_expression_editor\control.py", line 24, in wrapper_with_args
#     return function(*args, **kwargs)
#            ^^^^^^^^^^^^^^^^^^^^^^^^^
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\mh_expression_editor\1.12.7\mh_expression_editor\control.py", line 345, in match_joints_in_scene
#     self.ml_joints_matching_handler_single_expression.load_model(
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\frt_api\2.4.0\frt_api\rig\joints_matching.py", line 165, in load_model
#     self.ml_joints_matching.loadModel(configuration_file_path, batch_size)
#   File "D:\p4\dt_artist_01\Tools\Maya\shared\MHForMaya57\MetaHumanForMaya\lib\nls\8.0.14.1\platform-windows\python-3.11\nls\jointsmatchingml.py", line 13, in loadModel
#     self.opt.loadModel(modelPath, batchSize)
# RuntimeError: Critical error (OrtSessionRegistry.cpp, l431): Ort Error(2): Specified provider is not supported.

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2

Hi Michael,

We are aware of a potential runtime conflict between the onnxruntime.dll library shipped with MetaHuman for Maya and the one introduced by Autodesk in 2026.3.

We are looking at how to mitigate this, however do not have a fix ready at the moment.

Unfortunately, although I appreciate inconvenient, the only workaround is to use an earlier version of Maya, such as 2026.2 which does not have this conflict.

Thanks,

Mark.

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3

Great, thank you for letting us know that worked as expected. We’ll publish an update to MetaHuman for Maya once we’ve prepared an appropriate workaround.

Mark.

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4

Thanks Mark. I verified that does in fact work in 2026.2. Appreciate the quick response!

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