[Python.NET] I have python.net problem can't solved, please help

Dear sir I try to use pythonnet to test import my own python file, after I try, I can load my python file already. But, when I need to call the function in python file, it always shown the exception in PyObject then can not use the function I made in python file. I try many way then can’t work. I use the environment as follow:

.net : VS 2015 Python Interpreter : Python 3.6.3 x64 OS : Windows 7 DLL : Python.Runtime.dll of Release_Win_PY3 of Python for net on github

There are attached files, please help to check where is the problem, i really can’t find the solution on the forum. Thanks for any help. Tom tom19760909@gmail.com Tom