[Tex/LaTex] Package pgf Error: No shape named is known

tikz-pgftrees

I have encountered a problem

Package pgf Error: No shape named is known

but, I do not know what's wrong with it and how to fix it?
Can anybody help me?

My code is as follows:

\documentclass{minimal}
\usepackage{tikz}
\usepackage{verbatim}
\usepackage{CJKutf8}
\usetikzlibrary{shapes}
\usepackage{amsmath}
\usepackage{xspace}
\newcommand{\A}{\ensuremath{\mathcal{A}}\xspace}
\newcommand{\B}{\ensuremath{\mathcal{B}}\xspace}
\newcommand\pa[1]{\ensuremath{\left(#1\right)}}
\begin{document}
\begin{CJK}{UTF8}{gbsn}
\begin{tikzpicture}[
grow=right,
level 1/.style={sibling distance=.5cm,level distance=5.2cm},
level 2/.style={sibling distance=3.5cm, level distance=3.7cm},
edge from parent/.style={very thick,draw=blue!40!black!60,
    shorten >=5pt, shorten <=5pt},
edge from parent path={(\tikzparentnode.east) -- (\tikzchildnode.west)},
kant/.style={text width=2cm, text centered, sloped},
every node/.style={text ragged, inner sep=2mm},
punkt/.style={rectangle, rounded corners, shade, top color=white,
bottom color=blue!50!black!20, draw=blue!40!black!60, very
thick }
]

\node[punkt, text width=4.5em] {未知相关\\估计信息}
%Lower part lv1
child {
    node[punkt, text width=4em]
       {完全未知}                 
%----------------------------------------------
             child {
        node [punkt,rectangle split, rectangle split,
        rectangle split parts=2] {
            \textbf{非随机意义下：}
            \nodepart{second}
            相关估计信息未知但有界                            }
        edge from parent
            node[below, kant,  pos=.6] {}
    }
    child {
        node [punkt, rectangle split, rectangle split parts=2]{
            \textbf{随机意义下：}
            \nodepart{second}
            互协方差信息未知但有界
        }
        edge from parent
            node[kant, above] {}}
        edge from parent{
            node[kant, below] {}}
    }

%Upper part, lv1

child {
    node[punkt, text width=4em] {部分未知}
    %child 1
    child {
        node [punkt,rectangle split, rectangle split,
        rectangle split parts=2] {
            \textbf{非随机意义下：}
            \nodepart{second}
            相关估计信息未知但有界                            }  
        edge from parent
            node[below, kant,  pos=.6] {}
    }
    %child 2
    child {
        node [punkt, rectangle split, rectangle split parts=2]{
            \textbf{随机意义下：}
            \nodepart{second}
            互协方差信息未知但有界
        }
        edge from parent
            node[kant, above] {}}
        edge from parent{
            node[kant, above] {}}
}

\end{tikzpicture}
\end{CJK}
\end{document}

Best Answer

A tree abhors a vacuum. You cannot leave blank lines like that in the middle of the tree.

Also, you need a semicolon to finish the path, and you need to change the sibling distance to prevent the upper and lower branches from overlapping each other.

I've also removed packages not needed in your MWE (but obviously you will want them in your document) and changed the class. minimal is not suitable for use in examples. standalone or article are recommended alternatives.

\documentclass[tikz,border=5pt]{standalone}
\usepackage{CJKutf8}
\usetikzlibrary{shapes}
\begin{document}
\begin{CJK}{UTF8}{gbsn}
\begin{tikzpicture}
  [
    grow=right,
    level 1/.style={sibling distance=5.5cm,level distance=5.2cm},
    level 2/.style={sibling distance=3.5cm, level distance=3.7cm},
    edge from parent/.style={very thick,draw=blue!40!black!60, shorten >=5pt, shorten <=5pt},
    edge from parent path={(\tikzparentnode.east) -- (\tikzchildnode.west)},
    kant/.style={text width=2cm, text centered, sloped},
    every node/.style={text ragged, inner sep=2mm},
    punkt/.style={rectangle, rounded corners, shade, top color=white, bottom color=blue!50!black!20, draw=blue!40!black!60, very thick }
  ]

  \node[punkt, text width=4.5em] {未知相关\\估计信息}
  %Lower part lv1
  child {
    node[punkt, text width=4em]
    {完全未知}
    %----------------------------------------------
    child {
      node [punkt,rectangle split, rectangle split, rectangle split parts=2] {
        \textbf{非随机意义下：}
        \nodepart{second}
        相关估计信息未知但有界}
      edge from parent
      node[below, kant,  pos=.6] {}
    }
    child {
      node [punkt, rectangle split, rectangle split parts=2]{
        \textbf{随机意义下：}
        \nodepart{second}
        互协方差信息未知但有界
      }
      edge from parent
      node[kant, above] {}}
    edge from parent{
      node[kant, below] {}}
  }
  %Upper part, lv1
  child {
    node[punkt, text width=4em] {部分未知}
    %child 1
    child {
      node [punkt,rectangle split, rectangle split,
      rectangle split parts=2] {
        \textbf{非随机意义下：}
        \nodepart{second}
        相关估计信息未知但有界}
      edge from parent
      node[below, kant,  pos=.6] {}
    }
    %child 2
    child {
      node [punkt, rectangle split, rectangle split parts=2]{
        \textbf{随机意义下：}
        \nodepart{second}
        互协方差信息未知但有界
      }
      edge from parent
      node[kant, above] {}}
    edge from parent{
      node[kant, above] {}}
  }
  ;

\end{tikzpicture}
\end{CJK}
\end{document}

tree

Related Question