Build error "File threading.py, line 926, in _bootstrap_inner self.run()" in mbed studio

Using the following URL as a reference, I created a GR-MANGO project in mbed studio and then created a custom target.
https://community-ja.renesas.com/gr_user_forum_japanese/f/gr-mango/6197/mbed-studio-gr-mango-l

After that, when I build it in Mbed studio, the following error occurs:

I don’t know the cause, please advise me.

Hmm, it looks like something in the build process is choking on a non-ASCII character. Unfortunately it doesn’t show what file… I’d say scrub all the files you added for any non-ASCII characters.

No non-ASCII characters were found in your source files.


When I check the Problems tab, it looks like an error has occurred in mbed.h, but I don’t know why.
Could you please teach me?

Because your windows account name contains multibyte code.

Thank you for your advice.
I was able to solve the problem thanks to you.