About Build Error C4828

While building for a specific platform, error C4828 appears.
This error is >> The file contains a character starting at offset 0xvalue that is illegal in the current source character set (codepage number).
Of course, this can be solved by saving the source code in UTF-8 format, but it cannot be adopted because problems arise during the process of merging with the existing SVN.

I added the command line below to BuildTool, but it was the same.
"/source-charset:utf-8 "
“/execution-charset:utf-8”

Is there any way?

Greetings @fedy3234

Welcome to the Unreal Engine Community Forums! This error is generally due to invalid characters. Take a peek at this post. This should explain more about what you’re looking at and how to fix it. I hope that this helps!