This looks pretty much exactly like this bug report from 2011:Creation of OpenSim model from C:\Users\kchadwick\Desktop\DeformableFemur\deformFemur2002.jnt failed.
Executing [simmToOpenSim -j "C:\Users\kchadwick\Desktop\DeformableFemur\deformFemur2002.jnt" -m "C:\Users\kchadwick\Desktop\DeformableFemur\deformFemur2002.msl" -g Geometry -x "deformFemur2002_0.osim"]
simmToOpenSim, version 2.0.0, build date 09:22:35 Feb 5 2010
Read joint file C:\Users\kchadwick\Desktop\DeformableFemur\deformFemur2002.jnt
Joint walker_knee cannot be converted to OpenSim because it contains a [function] translation after a rotation.
1546 https://simtk.org/tracker/index.php?fun ... 1&atid=322
but I don't see any resolution. Apparently it worked in 1.9.1, should I just install that old version to do the conversion?
Thanks,
Kyle Chadwick