I see EnergyPlus has a Python plugin to couple simulations between energyplus and python script. I have two questions: (1) how to run such simulation through EP-Launch?
I tried one example through EP-launch:

PythonPluginCustomSchedule.idf

The error i got:

Program Version,EnergyPlus, Version 9.4.0-998c4b761e, YMD=2020.12.28 11:14,
** Severe  ** Failed to import module "PythonPluginCustomSchedule"
**   ~~~   ** Python error description follows: 
**   ~~~   ** ModuleNotFoundError("No module named 'PythonPluginCustomSchedule'")
**  Fatal  ** In reportPythonError(), traceback.format_exception did not return a list.
...Summary of Errors that led to program termination:
..... Reference severe error count=1
..... Last severe error=Failed to import module "PythonPluginCustomSchedule"
**  Fatal  ** In reportPythonError(), traceback.format_exception did not return a list.
...Summary of Errors that led to program termination:
..... Reference severe error count=1
..... Last severe error=Failed to import module "PythonPluginCustomSchedule"*

(2) is it only working at command line?