What is the name of that file ?
Error seems clear to me.
- You have a file with some special chars that is called with
rmarkdown will remove those chars to try another file without those chars. We need this for handling resources correctly if I remember well.
- Somehow you already have a file with the simplified name - is it yours ? Or past one not deleted properly after render ?
Either it is an issue of leftover from a previous rendering or we have an issue / special edge case in the dealing of files with special chars. In the latter case, I need to know more about the current context (filename, ...)