环境： LyX 2.0 @ Win 8.0
错误讯息：
文件类别无法使用
The selected document class
article
requires external files that are not available.
The document class can still be used, but the
document acannot be compiled until the following
prerequisites are installed:
article.cls
See section 3.1.2.2(Class Availability) of the
User's Guide for more information.
但是档案的确安装进去了 LyX 设定的路径也是对的
请问有人知道问题出在哪吗?

重新配置？