On 2020/10/14 2:09, Hoffmann, Jobst wrote: > I try to compile a small LaTeX-file (the content doesn't matter), it > ends with an error message Probably your lua53.dll is an old one. u8getmbstring() is defined in lua53.dll in TeX Live 2020. "u8getmbstring" in luahbtex.dll is calling it in lua53.dll. Best, Akira