I am new to Blender and scripting, so this might as well be a general Blender thing, but since the affected method belongs to BCB, I thought I'd post here.
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\...\mwe.py", line 3, in <module>
bpy.ops.bcb.get_config()
File "C:\Users\...\Blender 2.79\2.79\scripts\modules\bpy\ops.py", line 189, in __call__
ret = op_call(self.idname_py(), None, kw)
RuntimeError: Error: Traceback (most recent call last):
File "C:\Users\...\Blender 2.79\2.79\scripts\addons\kk_bullet_constraints_builder\gui_buttons.py", line 72, in execute
warning = getConfigDataFromScene(scene)
File "C:\Users\...\Blender 2.79\2.79\scripts\addons\kk_bullet_constraints_builder\build_data.py", line 409, in getConfigDataFromScene
elemGrps = mem["elemGrps"]
KeyError: 'elemGrps'
location: C:\Users\...\Blender 2.79\2.79\scripts\modules\bpy\ops.py:189