Problem with the TikZ library hobby

Question

I am using the last version of MiKTeX. After the last update I realize that the TikZ library hobby is no longer working. As proposed by the answer of this question, I downloaded it again from here but when I compile the file tex hobby.dtx I got the error:

======================================================================

  ! LaTeX Error: File `l3doc.cls' not found.

 Type X to quit or <RETURN> to proceed,
 or enter new name. (Default extension: cls)

 Enter file name: 

I update again MiKTeX but I still have the same error. And when I compile a Latex file which contains the hobby library I get the error

!...............................................
l.185 ...riant:Nn \__msg_show_variable:Nnn { Nno }
|'''''''''''''''''''''''''''''''''''''''''''''''
| This is a coding error.
|
| LaTeX has been asked to use a control sequence '\__msg_show_variable:Nnn':
| this has not been defined yet.
|...............................................
 )
.................................................

This is the example that I compiled:

 \documentclass{standalone}
  \usepackage{tikz}
   \usetikzlibrary{hobby,decorations.markings}
 \begin{document}
    \begin{tikzpicture}[use Hobby shortcut]
     % middle crossing loop
      % \draw (3,-1) .. (2,0) .. (0,0.93) .. (-0.93,0) .. (0,-0.93) .. (2,0) .. (3,1);
  \begin{scope}
    \clip (3,-1) rectangle (2,1);
    \draw[thick, blue, fill=blue!30] (3,-1) .. (2,0) .. (0,0.93) .. (-0.93,0) .. (0,-0.93) .. (2,0) .. (3,1);
  \end{scope}
  \begin{scope}
    \clip (2,1) rectangle (-1,-1);
   \draw[thick, red, fill=red!30] (3,-1) .. (2,0) .. (0,0.93) .. (-0.93,0) .. (0,-0.93) .. (2,0) .. (3,1);
  \end{scope}
   % filled points
  \fill (0,0) circle (1pt);
  \fill (2,0) circle (1pt);
  \end{tikzpicture}
 \end{document}