I am new user Lyx. I just installed, Version LyX 2.1.4. After creating my first file, I run the DVI viewer, but I get this error:
You need to specify a language, either as a global option or as an optional argument to the \usepackage command; You shouldn't try to proceed from here, type x to quit.
I don't know how to set the language. My OS is Windows 10. Help please.