Acivs同仁们帮个忙,Latex编辑错误

Acivs同仁们帮个忙,Latex编辑错误
出错代码段
begin{abstract}
In this paper,a regularized kernel locality preserving discriminant
analysis (RKLPDA) method is proposed for facial feature extraction
and recognition.The proposed RKLPDA comes into the characteristic
of LPDA that encodes both the geometrical and discriminant structure
of the data manifold,and improves the classification ability for
linear non-separable data by introducing kernel trick.Meanwhile,by
regularizing the eigenvectors of the kernel locality preserving
within-class scatter,RKLPDA utilizes all the discriminant
information and eliminates the small sample size (SSS) problem.
Experiments on ORL and FERET face databases are performed to test
and evaluate the proposed algorithm.The results demonstrate the
effectiveness of RKLPDA.
keywords{Locality preserving discriminant
analysis,Kernel method,Feature extraction,Face recognition}
end{abstract}
我自己编译没有问题,但是上传到会议网站,自动检查的时候出现问题
in file ./paper112.tex at line 93:Undefined control sequence.l.93 keywords {Locality preserving discriminant[1{/usr/share/texmf/fonts/map/pdftex/updmap/pdftex.map}] [2] [3]