I am using TEX editor and have written the following code:

\documentclass[10  pt,a4paper,twoside,reqno]{amsart} 
\textwidth = 12.5 cm 
\textheight = 20 cm 
\topmargin = 0.5 cm 
\oddsidemargin = 1 cm 
\evensidemargin = 1 cm 
\title{Some Title}
\author{My Name}
\date{July 25, 2015}
\abstract{Some text....
Some text.....


When I click "Quick Build" I get the following error ! You can't use `\end' in internal vertical mode. on Line 27 (Line containing \end{document}). Please explain why does this error occur and how should I got about fixing it.

2 Answers 2


The abstract for an amsart document should be given in environment for


Given as just \abstract, TeX is collecting a box, and you can't end the run the document in that situation. As there's no \end{abstract} you never close the box properly.


The same error occurs if you by accident delete or forget to close a curly bracket


Such as in this example

\label{This is a caption after which you forgot to close the bracket, exactly here -->
  • This code produces the error Paragraph ended before \label was complete. That's not the same as You can't use \end in internal vertical mode.
    – campa
    Oct 17, 2020 at 14:33
  • In my case it did produce the error "You can't use \end in internal vertical mode." That's why I ended up here in the first place.
    – mrk
    Oct 18, 2020 at 6:43

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