Blender Source Error

Error: Traceback (most recent call last):
  File "C:\Users\XY\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\io_scene_valvesource\import_smd.py", line 70, in execute
    self.num_files_imported = self.readQC(filepath, False, self.properties.doAnim, self.properties.makeCamera, self.properties.rotMode, outer_qc=True)
  File "C:\Users\XY\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\io_scene_valvesource\import_smd.py", line 994, in readQC
    print("\nQC IMPORTER: now working on",filename)
  File "C:\Users\XY\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\io_scene_valvesource\utils.py", line 90, in print
    builtins.print(" ".join([str(a) for a in args]).encode(sys.getdefaultencoding()).decode(sys.stdout.encoding), end= "\n" if newline else "", flush=True)
TypeError: decode() argument 1 must be str, not None

location: C:\Program Files\Blender Foundation\Blender\2.78\scripts\modules\bpy\ops.py:189


Traceback (most recent call last):
  File "<blender_console>", line 1, in <module>
  File "C:\Program Files\Blender Foundation\Blender\2.78\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\XY\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\io_scene_valvesource\import_smd.py", line 70, in execute
    self.num_files_imported = self.readQC(filepath, False, self.properties.doAnim, self.properties.makeCamera, self.properties.rotMode, outer_qc=True)
  File "C:\Users\XY\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\io_scene_valvesource\import_smd.py", line 994, in readQC
    print("\nQC IMPORTER: now working on",filename)
  File "C:\Users\XY\AppData\Roaming\Blender Foundation\Blender\2.78\scripts\addons\io_scene_valvesource\utils.py", line 90, in print
    builtins.print(" ".join([str(a) for a in args]).encode(sys.getdefaultencoding()).decode(sys.stdout.encoding), end= "\n" if newline else "", flush=True)
TypeError: decode() argument 1 must be str, not None

location: C:\Program Files\Blender Foundation\Blender\2.78\scripts\modules\bpy\ops.py:189