Error Multilingual text in lyx

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%% LyX 2.3.3 created this file.  For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\documentclass{article}
\begin{document}
\title{\selectlanguage{american}%
How\foreignlanguage{spanish}{ to write multilingual text with different
scripts in lyx for Dummies}}
\author{\selectlanguage{spanish}%
Lyx Community}
\maketitle

\section{Spanish}

Como escribir diferentes lenguajes en lyx para principiantes

\section{Chinese}

<LyX Warning: uncodable character '如'><LyX Warning: uncodable character '何'><LyX Warning: uncodable character '用'><LyX Warning: uncodable character 'l'><LyX Warning: uncodable character 'y'><LyX Warning: uncodable character 'x'><LyX Warning: uncodable character '中'><LyX Warning: uncodable character '的'><LyX Warning: uncodable character '不'><LyX Warning: uncodable character '同'><LyX Warning: uncodable character '腳'><LyX Warning: uncodable character '本'><LyX Warning: uncodable character '編'><LyX Warning: uncodable character '寫'><LyX Warning: uncodable character '多'><LyX Warning: uncodable character '語'><LyX Warning: uncodable character '言'><LyX Warning: uncodable character '文'><LyX Warning: uncodable character '本'>

\section{Hindi}

कैसे गीत में विभिन्न लिपियों के साथ बहुभाषी पाठ लिखने के लिए

\selectlanguage{spanish}%

\end{document}