ERROR: problems during latex INPUT: \documentclass[fleqn,12pt]{article} \usepackage{amsmath} \usepackage[normal]{xcolor} \setlength{\mathindent}{0cm} \definecolor{teal}{rgb}{0,0.5,0.5} \definecolor{navy}{rgb}{0,0,0.5} \definecolor{aqua}{rgb}{0,1,1} \definecolor{lime}{rgb}{0,1,0} \definecolor{maroon}{rgb}{0.5,0,0} \definecolor{silver}{gray}{0.75} \usepackage{latexsym} \begin{document} \pagestyle{empty} \pagecolor{white} { \color{black} \begin{math}\displaystyle \begin{parsetree} ( .S. (.NP. `we') ( .VP. (.V. `gave' ) (.NP. `them') (.NP. ~ `a toy') ) ) \end{parsetree}\end{math} } \clearpage \end{document} STDERR: This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian) entering extended mode (/tmp/skqxUeEjbw/hqodympNbY LaTeX2e <2009/09/24> Babeland hyphenation patterns for english, usenglishmax, dumylang, noh yphenation, loaded. (/usr/share/texmf-texlive/tex/latex/base/article.cls Document Class: article 2007/10/19 v1.4h Standard LaTeX document class (/usr/share/texmf-texlive/tex/latex/base/fleqn.clo) (/usr/share/texmf-texlive/tex/latex/base/size12.clo)) (/usr/share/texmf-texlive/tex/latex/amsmath/amsmath.sty For additional information on amsmath, use the `?' option. (/usr/share/texmf-texlive/tex/latex/amsmath/amstext.sty (/usr/share/texmf-texlive/tex/latex/amsmath/amsgen.sty)) (/usr/share/texmf-texlive/tex/latex/amsmath/amsbsy.sty) (/usr/share/texmf-texlive/tex/latex/amsmath/amsopn.sty)) (/usr/share/texmf/tex/latex/xcolor/xcolor.sty (/etc/texmf/tex/latex/config/color.cfg) (/usr/share/texmf-texlive/tex/latex/graphics/dvips.def)) (/usr/share/texmf-texlive/tex/latex/base/latexsym.sty) No file hqodympNbY.aux. (/usr/share/texmf-texlive/tex/latex/base/ulasy.fd) ! LaTeX Error: Environment parsetree undefined. See the LaTeX manual or LaTeX Companion for explanation. Type H for immediate help. ... l.17 \begin{math}\displaystyle \begin{parsetree} ! LaTeX Error: \begin{math} on input line 17 ended by \end{parsetree}. See the LaTeX manual or LaTeX Companion for explanation. Type H for immediate help. ... l.26 \end{parsetree} \end{math} [1] (./hqodympNbY.aux) ) (see the transcript file for additional information) Output written on hqodympNbY.dvi (1 page, 612 bytes). Transcript written on hqodympNbY.log.