Error code in C#

Hi,
Couls someone know the error in the code (line 59)

@albertomorales
Line 59 only worked fine for BlueCFD environment,not for windows cmd environment.
You can generate .bat file and use python to call this file.

how can I call a .bat file in python?

It is a comom question. You can ask ChatGPT. Here is a simple answer.