How to debug the "Argument of \XC@definec@lor has an extra }" error in Foreach statement?

Question

First, I draw three nodes each of which has three parts. Everything is OK. The code and the image are as follows.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[]{tikz}
\usetikzlibrary{shapes}

\begin{document}
  \begin{tikzpicture}[]
    \foreach  \placement in {(0,0),(3.5,0),(1.75,2.5)}
         \node [rectangle split, rectangle split parts = 3, rounded corners, 
         draw, inner ysep = 0.2cm, inner xsep = 1.5pt, 
         rectangle split part fill = {blue!40, lightgray!80, red!40}, 
         rectangle split every empty part={}, 
         rectangle split empty part height = 0pt] 
         at \placement 
         {\texttt{Client} \nodepart{two} \nodepart{three} \texttt{Server}};
  \end{tikzpicture}
\end{document}

client_server_onenode http://i1.tietuku.com/cf947fb25d21a591.png

Then I want to assign names to the nodes by adding another parameter \name in the \foreach statement.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[]{tikz}
\usetikzlibrary{shapes}

\begin{document}
  \begin{tikzpicture}[]
    \foreach  \name/\placement in {box0/(0,0),box1/(3.5,0), box2/(1.75,2.5)}
         \node [rectangle split, rectangle split parts = 3, rounded corners, draw, 
          inner ysep = 0.2cm, inner xsep = 1.5pt, 
          rectangle split part fill = {blue!40, lightgray!80, red!40}, 
          rectangle split every empty part={}, 
          rectangle split empty part height = 0pt] 
          (\name) 
          at \placement        
          {\texttt{Client} \nodepart{two} \nodepart{three} \texttt{Server}};
  \end{tikzpicture}
\end{document}

This time I get the following errors:

Argument of \XC@definec@lor has an extra }; I've run across a "}" that doesn't seem to match anything.

I am confused about the debug information because I have not added any extra `}'s to the code. Any suggestion to handle with this problem?

NOTE: You can find the read-only source code and debug information at ShareLaTex: Foreach with two arguments.

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The related post : How do I debug the message “Argument of \XC@definec@lor has an extra }” has been closed without an MWE.