[beta testers wanted!] Jython addon w/ helper libraries (requires OH 2.5.x)

I have OH 2.5 on Windows 10, Oracle java jdk1.8.0_211, I installed Jython addon helper libraries and the rule engine (experimental). I followed the instructions listed in [beta testers wanted!] Jython addon w/ helper libraries (requires OH 2.5) and those indicated there on links. However, the hello_world.py script is not automatically activated and I have to edit it and then save it for this to happen. However, it immediately goes into error:

2019-12-30 11: 02: 26.801 [INFO] [me.core.service.AbstractWatchService] - Loading script 'python/personal/hello_world.py'

2019-12-30 11: 02: 26.801 [DEBUG] [ipt.internal.ScriptEngineManagerImpl] - Added ScriptEngine for language 'py' with identifier: file:/D:/openHAB2/conf/automation/jsr223/python/personal/hello_world.py

2019-12-30 11: 02: 26.820 [ERROR] [ipt.internal.ScriptEngineManagerImpl] - Error during evaluation of script 'file:/D:/openHAB2/conf/automation/jsr223/python/personal/hello_world.py': ImportError: No module named _FunctionRule in <script> at line number 5

Anyone know by chance if jython has any problem loading scripts automatically in windows 10?

Thank you very much