\documentclass 中未定义控制序列?

\documentclass 中未定义控制序列?

您好,我正在从 MiKTeX 运行 TexWorks 并不断收到此错误:

! Undefined control sequence.
l.6 \documentclass
                  [prd,12pt,reprint,showkeys,showpacs,nofootinbib]{revtex4-1}
? 

以下是我的整个序言:

\documentclass[prd,12pt,reprint,showkeys,showpacs,nofootinbib]{revtex4-1}

%additional macros
\usepackage{amsmath} % for creating subequations
\usepackage{graphicx} % for insterting figures
\usepackage{verbatim} % for including verbatim text
\usepackage{color} % for colored text
\usepackage{subfigure} % for side-by-side figures
\usepackage{hyperref} % for creating hypertext links

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