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Thanks. xfrac works fine.

I've just installed TeX Live 2019 and can not find the nicefrac package. It can not be found in the repository or in the installed packages. Has it been removed permanently? Maybe there is a replacement for it?

This is the path to the folder where the lyx file is located. I do not know why the program is looking for configuration files here.

I do not have a geometry.cfg file in this foder. This is the folder where the lyx file that I want to compile is located. I attached the geometry.sty file.

I added the log file.

I really do not know which option it is. Is it about File-> Export-> LaTeX (pdflatex)? Because I do not know where this file appears. There is no such file in the folder where the file is compiled. I added a file exported to pure LaTeX. If it does not help, I do not know what to do.

Do you mean a pdf file?

Here is the LyX file which generates the error.

Switching to utf8 does not help. I've attached the url file, which I did not modify.

Can anyone check the attached log file? I thought I had everything in LyX well set up and yet the program generates errors.