when I have installed and built ros2 beta 2 on the system of Win10 as the tutorials,the link is:https://github.com/ros2/ros2/wiki/Windows-Development-Setup
then run the demo:
> call install\local_setup.bat
> ros2 run demo_nodes_py talker
after,the output is:
Failed to load entry point 'start': DLL load failed: 
Failed to load entry point 'status': DLL load failed: 
Failed to load entry point 'stop': DLL load failed: 
Failed to load entry point 'list': DLL load failed: 
Failed to load entry point 'call': DLL load failed: 
Failed to load entry point 'list': DLL load failed: 
Failed to load entry point 'echo': DLL load failed: 
Failed to load entry point 'list': DLL load failed: 
Failed to load entry point 'pub': DLL load failed: 
Traceback (most recent call last):
  File "C:\dev\ros2\install\lib\demo_nodes_py\talker-script.py", line 11, in <module>
    load_entry_point('demo-nodes-py==0.0.0', 'console_scripts', 'talker')()
  File "C:\Progra~1\Python36\lib\site-packages\pkg_resources\__init__.py", line 564, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "C:\Progra~1\Python36\lib\site-packages\pkg_resources\__init__.py", line 2662, in load_entry_point
    return ep.load()
  File "C:\Progra~1\Python36\lib\site-packages\pkg_resources\__init__.py", line 2316, in load
    return self.resolve()
  File "C:\Progra~1\Python36\lib\site-packages\pkg_resources\__init__.py", line 2322, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "C:\dev\ros2\install\Lib\site-packages\topics\talker.py", line 18, in <module>
    import rclpy
  File "C:\dev\ros2\install\Lib\site-packages\rclpy\__init__.py", line 18, in <module>
    from rclpy.impl.implementation_singleton import rclpy_implementation as _rclpy
  File "C:\dev\ros2\install\Lib\site-packages\rclpy\impl\implementation_singleton.py", line 32, in <module>
    rclpy_implementation = importlib.import_module('._rclpy', package='rclpy')
  File "C:\Progra~1\Python36\lib\importlib\__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ImportError: DLL load failed: 





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