the \usepackage[T1]{fontenc} line is certainly wrong for xetex but on
my updated (cygwin) texlive 2018 pdfinfo doesn't give any errors on
the generated file with or without this line.
what happens if you use --no-pdf to xelatex and then run xdvipdfmx by
hand on the resulting xdv, that usually gives better diagnostics for
pdf generation stage.
David