latex引用网页报错

我在tex中导入了\usepackage{url}

在bib文件中引用UCI数据集：

@misc{Dua2017 ,
author = {Dua, D. and Graff, C.},
title = {{UCI} Machine Learning Repository},
year = {2017},
url = {http://archive.ics.uci.edu/ml},
% institution = {University of California, Irvine, School of Information and Computer Sciences}
}

正文中引用

\cite{Dua2017}

生成pdf就一直报错，如下

Underfull \vbox (badness 1931) has occurred while \output is active [10 <./figu
re/5-eps-converted-to.pdf> <./figure/6-eps-converted-to.pdf> <./figure/7-eps-co
nverted-to.pdf>] (FITEE_ZR_04.12.bbl
! Argument of \@lbibitem has an extra }.
<inserted text> 
                \par 
l.36 \bibitem[}
               {2017}]{Dua2017}
? 

真的不知道问题在哪，只要不引用Dua2017就不会报错。搜了好久也没解决，请大神们帮帮忙！！！