\usepackage[table, dvipsnames]{xcolor}
\usepackage{color, colortbl}




\title{blah blah blah %\tnotetext[mytitlenote]{Fully documented templates are available in the elsarticle package on \href{http://www.ctan.org/tex-archive/macros/latex/contrib/elsarticle}{CTAN}.}

%% Group authors per affiliation:

\author{M.Sobhani Sanjabad}%\fnref{myfootnote}

\address{Razi University, Ardabil, Iran}

\address{University of Qom, Qom, Iran}

\address{Istanbul Technical University}



blah blah blah ....



\texttt{elsarticle.cls} \sep forecasting \sep Genetic programming \sep wavelet \sep ANN method

\MSC[2010] 00-01\sep  99-00




this error appears

! LaTeX Error: Something's wrong--perhaps a missing \item.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.


How can I fix this?

  • Welcome to TeX.SX! Don't load titling with elsarticle. – egreg Sep 16 '18 at 15:42

Don't load packages that change the formatting, when using elsarticle, because the class is intended for submissions to Elsevier and they don't want strange or personalized titles or other elements.

In your case, avoid titling (and also ltxfront which is part of RevTeX).

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