Misplaced \noalign. \hline ->\noalign Was verursacht diesen Fehler?

Mit diesem Code erhalte ich einen Fehler:

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\documentclass{article}
\usepackage[ngerman]{babel}
\usepackage{dsfont}
\begin{document}
\begin{figure}
  \centering
  \begin{tabular}{rr}
                   \hline
         $x$ & $\pi(x)$ \\
    \hline
        10 & 4     \\
       100 & 25    \\
      1000 & 168   \\
     10000 & 1229  \\
    100000 & 9592  \hline
  \end{tabular}
  \caption{Primzahlfunktion: $\pi(x)=\#\{p\in\mathds{P} \mid p\le x\}$}
\end{figure}
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Die Fehlermeldung ist:

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! Misplaced \noalign.
\hline ->\noalign 
                  {\ifnum 0=`}\fi \hrule \@height \arrayrulewidth \futurelet...
l.15     100000 & 9592  \hline
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Der Fehler trat auf, nachdem ich das letzte \hline eingefügt habe. Ich habe auch array statt tabular probiert, würde eh besser passen wegen mathematischem Inhalt, da kommt aber der gleiche Fehler. Ohne das \hline wird es fehlerfrei übersetzt, nur möchte ich gern diese Linie am Ende der Tabelle.

Warum geht das hier nicht?