使用animateinline制作动画出现CJK报错 非法字符：Package CJK Error: Invalid character code

\documentclass{beamer}
\usepackage{ctex}
\usepackage{tikz}
\usetheme{CambridgeUS}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{animate}
\begin{document}
\begin{frame}
    \frametitle{问题探究}
    如图，在单位圆上，将点$A$绕着点$O$旋转$x_0$弧度至点$B$，根据正弦函数的定义，点$B$的纵坐标$y_0=\sin x_0$.
    由此，以$x_0$为横坐标，$y_0$为纵坐标画点，即得到函数图象上的点$T\left(x_0,\sin x_0\right)$.
    \begin{animateinline}[autoplay,loop,begin={\begin{tikzpicture}
      \draw[->] (-2.1,0) -- (7,0) node[below,font=\tiny]{$x$};
      \node[below,sep=2pt,fill=white,font=\tiny] at (0,0) {$O$};
      \draw[->] (0,-2.1) -- (0,2) node[right,font=\tiny]{$y$};
      \node[below,outer sep=2pt,fill=white,font=\tiny] at (6.28,0) {$2\pi$};
      \node[below,outer sep=2pt,fill=white,font=\tiny] at (1.570,0) {$\frac{\pi}{2}$};
      \node[below,outer sep=2pt,fill=white,font=\tiny] at (3.141,0) {$\pi$};
      \node[below,outer sep=2pt,fill=white,font=\tiny] at (4.712,0) {$\frac{3\pi}{2}$};
      \node[left,outer sep=2pt,fill=white,font=\tiny] at (0,1) {$1$};
      \node[left,outer sep=2pt,fill=white,font=\tiny] at (0,-1) {$-1$};
      \node[below,outer sep=2pt,fill=white,font=\tiny] at (1,0) {$A$};
      \filldraw (1,0) circle (1pt);
     },end={\end{tikzpicture}}][5]
\multiframe{25}{rp=0+10}
{
  \draw[fill=yellow,domain=0:\rp] (0,0) -- (1,0) arc (0:\ip:1)node[font=\tiny,right]{$A$} -- cycle;
}
\end{animateinline}
\end{frame}
\end{document}

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