Exporting issue (Chinese language)

I'm working with a course built in Chinese language. This is actually a translation based on a version in English, which used to work fine.

However, I cannot export or preview the course in Chinese. Basically, the bar starts loading but then the file closes abruptly. I'm not sure if it is a matter with the fonts (I changed them to Noto first, then to Microsoft YaHei), player or what. I tried using the old player but it doesn't work either.

The translation was manually made as I didn't know about the Exporting/Importing for translation option. So that's why I'm guessing the issue is somewhere with the fonts, because all of the settings other than that, are the same ones as for the English version, which is working.

Can anyone help me?