I really got stuck with this problem....I could not figure out what the causes are... The idea is that I drawed two tree structures which face each other.. the sample is here..
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\documentclass{article}
\usepackage{tikz}
\tikzstyle{every picture}+=[remember picture]
\usetikzlibrary{shapes,arrows}
\tikzstyle{decision} = [diamond, draw, text width=4.5em, text badly centered, node distance=3cm, inner sep=0pt]
\tikzstyle{block} = [rectangle, draw, text width=5em, text centered, rounded corners, minimum height=4em]
\usetikzlibrary{positioning}
\raggedbottom
\usepackage{tikz-qtree}
\usepackage{tree-dvips}
\begin{document}
\begin{tikzpicture}
\tikzstyle{level 1}=[sibling distance=45mm]
\tikzstyle{level 3}=[sibling distance=28mm]
\tikzstyle{level 4}=[sibling distance=20mm]
\node{\shortstack{$\textbf{c-structure}$\\IP}}
child {node {NP} child {node {\shortstack{N}} child { child { child {node {Lee}}}}}}
child {node {I$'$}
child {node {I} child { child { child {node {may}}}}}
child {node {VP}
child {node {V} child { child {node {MIMIC}}}}
child {node {NP}
child {node {DET}
child {node{my}}}
child {node {N}
child {node {niece}}}}}
};
\end{tikzpicture}
\begin{tikzpicture}
\tikzstyle{level 1}=[sibling distance=60mm]
\tikzstyle{level 2}=[sibling distance=19.9mm]
\node {\shortstack{utterance\\$\textbf{p-structure}$}} [grow'=up]
child { child {node {\shortstack{PW\\$\nearrow=\swarrow$}} child {node {}}} child {node {\shortstack{PW\\$\nearrow=\swarrow$}} child {node {}}}}
child {node {\shortstack{Focus contour\\$\nearrow=\swarrow$}} { child {node {\shortstack{PW\\$\swarrow$ PR=e\\ $\nearrow$$\in$($\swarrow$ FOCUS)$}} child {node {d}}} child {node {\shortstack{PW\\$\swarrow$ PR=c\\ $\nearrow=\swarrow$}} child {node {}}} child {node {\shortstack{PW\\$\swarrow$ PR=c\\ $\nearrow$=$\swarrow$}}child {node {}}}}};
\end{tikzpicture}
\end{document}
the source of the problem is this:
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No file glue.aux.
ABD: EveryShipout initializing macros
! Extra }, or forgotten $.
<recently read> }
l.36 ...$\nearrow$=$\swarrow$}}child {node {}}}}};
? 
