{\small{\em Keywords\/}: #1}}
\title{strong text}
\author{ \and
\centerline{Department of Computer Engineering,College of engineering,city}}

  • Note that you can mark text as 'code' by using indenting each line by four spaces. I tried to edit your code, but there are two problems that remain: (i) it is incomplete; (ii) lines 11-11 are blank, so I'm not fully convinced this code is the code causing the problems (or I edited it wrongly). – jon Jan 13 '17 at 5:07
  • Who taught you to use \centerline there? Please reprimand them. – Martin Schröder Jan 13 '17 at 6:28

There is no need for \centerline within the \author declaration, since the \author - set as part of \maketitle - is already centred. So, remove it (and the seemingly superfluous \and):

enter image description here


\title{strong text}
\author{Department of Computer Engineering, College of Engineering, City}



Some abstract

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