I downloaded the Latex template file from a mathematics journal site so that I can write my article according to the journal submission guidelines. Now as I am trying to write it's not running. I tried to add corresponding packages but then again there is a problem. Even $\mathbb $ is not working. Please suggest what I could do. I am adding picture of that 
In textfile it is
\documentclass{bmcart}
\usepackage{amsthm,amsmath}
\def\includegraphic{}
\def\includegraphics{}
\startlocaldefs
\endlocaldefs
\begin{document}
\begin{frontmatter}
\begin{fmbox}
\dochead{Research}
\title{The }
\author[
addressref={aff1}, % id's of addresses, e.g. {aff1,aff2}
corref={aff1}, % id of corresponding address, if any
% noteref={n1}, % id's of article notes, if any
email={jane.e.doe@cambridge.co.uk} % email address
]{\inits{J.E.}\fnm{Jane E.} \snm{Doe}}
\author[
addressref={aff1,aff2},
email={john.RS.Smith@cambridge.co.uk}
]{\inits{J.R.S.}\fnm{John R.S.} \snm{Smith}}
\address[id=aff1]{% % unique id
\orgdiv{Department of Science}, % department, if any
\orgname{University of Cambridge}, % university, etc
\city{London}, % city
\cny{UK} % country
}
\address[id=aff2]{%
\orgdiv{Institute of Biology},
\orgname{National University of Sciences},
%\street{},
%\postcode{}
\city{Kiel},
\cny{Germany}
}
\end{fmbox}% comment this for two column layout
\begin{abstractbox}
\begin{abstract} % abstract
\parttitle{First part title} %if any
Text for this section.
\parttitle{Second part title} %if any
Text for this section.
\end{abstract}
\mathbb, as an edit to your question. Also provide a link where we can find the template online. Finally, provide the exact text of the error message(s) that you get. With that information we will probably be able to help you, without it we can't do much. – Marijn Mar 14 '23 at 13:25\endstatements, for theabstractbox, thefontmatter, and thedocument. Also it doesn't demonstrate the use of\mathbb. Furthermore you did not provide a link for the documentclass or the text of the error message that you get. Can you add those missing pieces of information as well? – Marijn Mar 14 '23 at 13:53\usepackage{amsfonts}will add\mathbb; that is the answer given in https://tex.stackexchange.com/q/38769 as already suggested. I don't know the document classbcmartand how it defines\title; it may be necessary to input this as\protect\mathbb. – barbara beeton Mar 14 '23 at 15:05