The cause of this is a non-ascii character in your Windows 10 username. Even if you have changed it - as changing it only does it symbolic.
There is a work around with what @BlondeAcrobat62 wrote or you can change Windows 10 to use the new Beta UTF-8 language set.
To do that, you have to go to “Control Panel” → “Clock and Region” → “Region” → “Administrative” Tab → “Change system regional configuration…” → and check the “Beta version: Use UTF-8 for language compatibility” checkbox.
EDIT: This post was merged from another topic.