Traceback Error in Blender

Trying to import a bvh file to a ‘teen rig’ in Blender and I get a traceback error. Am I doing something wrong, or is there a work around to get it to work?
Thanks!

p.s. I’m on an iMac running Mojave

Could you include the traceback? Which BVH file are you importing? Was it generated by NI mate?