biblatex 未定义控制序列错误在 \printbibliography

Question

我是 biblatex 的新手，在编译以下代码时收到以下错误：

! Undefined control sequence.
\namepartfamily ->\x
{fffd}\x {fffd}str\x {fffd}\x {fffd}m
l.16

tex 文件

\documentclass{article}
\usepackage[style=authoryear,sorting=none,backend=biber]{biblatex}
\addbibresource{aaa.bib}
\usepackage{url}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}

\begin{document}
\cite{aaa}

\printbibliography

\end{document}

bib文件

@InProceedings{aaa,
  author    = {aaa},
  title     = {aaa},
  booktitle = {aaa},
  year      = {1977},
  publisher = {ACM},
  date      = {1977},
  type      = {Conference Proceedings},
}

编译 pdflatex bib(la)tex pdflatex