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Unable to manually install Armory SDK

See original GitHub issue

I am trying to manually install the Armory SDK through Python in a newer version of Blender 2.8 than the version that the SDK comes with. But I get the following errors:

Error: Traceback (most recent call last):
  File "/home/amir/.config/blender/2.80/scripts/addons/armory.py", line 205, in execute
    start.register(local_sdk=local_sdk)
  File "/home/amir/Desktop/armory/blender-2.80/armsdk//armory/blender/start.py", line 22, in register
    arm.props_traits_props.register()
  File "/home/amir/Desktop/armory/blender-2.80/armsdk//armory/blender/arm/props_traits_props.py", line 36, in register
    bpy.utils.register_class(ArmTraitPropList)
RuntimeError: Error: 'ArmTraitPropList' doesn't contain '_UL_' with prefix & suffix


location: /home/amir/Desktop/armory/blender-2.80/2.80/scripts/modules/bpy/ops.py:200


Traceback (most recent call last):
  File "<blender_console>", line 1, in <module>
  File "/home/amir/Desktop/armory/blender-2.80/2.80/scripts/modules/bpy/ops.py", line 200, in __call__
    ret = op_call(self.idname_py(), None, kw)
RuntimeError: Error: Traceback (most recent call last):
  File "/home/amir/.config/blender/2.80/scripts/addons/armory.py", line 205, in execute
    start.register(local_sdk=local_sdk)
  File "/home/amir/Desktop/armory/blender-2.80/armsdk//armory/blender/start.py", line 22, in register
    arm.props_traits_props.register()
  File "/home/amir/Desktop/armory/blender-2.80/armsdk//armory/blender/arm/props_traits_props.py", line 36, in register
    bpy.utils.register_class(ArmTraitPropList)
RuntimeError: Error: 'ArmTraitPropList' doesn't contain '_UL_' with prefix & suffix


location: /home/amir/Desktop/armory/blender-2.80/2.80/scripts/modules/bpy/ops.py:200

And here are the steps I followed to install it:

1- copy Armory sdk into Blender’s directory 2- Execute the following commands in Blender’s Python console:

bpy.ops.preferences.addon_install(filepath='armsdk/armory/blender/addon/armory.py')
bpy.ops.preferences.addon_enable(module='armory')
user_prefs = bpy.context.preferences
addon_prefs = user_prefs.addons['armory'].preferences
addon_prefs.sdk_path = 'armsdk'
bpy.ops.arm_addon.start() #this throws and error

@luboslenco Am I doing something wrong?