LaTeX Error: Unknown graphics ex

用winedt 7.0 导入自动化学报的模板报以下错误

! LaTeX Error: Unknown graphics extension: .eps.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.442 \begin{biography}[ssl.eps]
                                
? 

结果发现只需要加\usepackage{epstopdf}即可