Thank you very much

Hi, I'm trying to enable the source tools in blender, and this is error I get
Traceback (most recent call last):
File "C:\Program Files\Blender Foundation\Blender\2.79\scripts\modules\addon_utils.py", line 331, in enable
mod = __import__(module_name)
File "C:\Users\dawid\AppData\Roaming\Blender Foundation\Blender\2.79\scripts\addons\io_scene_valvesource\__init__.py", line 55
icon : StringProperty()
^
Can someone help me with this? Thanks