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Hello,

I am using c3dExport.m in the OpenSim Matlab Scripts directory.
On some of my *.c3d files it appears to be working correctly, writing test-data.trc
On others, I have an issue with:
tables = C3DFileAdapter().read(path2c3d, ForceLocation);
The error is:
Java exception occurred:
java.lang.RuntimeException: invalid map<K, T> key

at org.opensim.modeling.opensimCommonJNI.C3DFileAdapter_read__SWIG_2(Native Method)

at org.opensim.modeling.C3DFileAdapter.read(C3DFileAdapter.java:82)

Could anyone provide any insight into this issue?

I think there has been an issue with exporting data when there is only one of force or marker data in the C3D. Do the c3d files that cause the exception have both force and marker data in them?

No, the offending *.c3d files have only marker data.