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SOLVED thnx!!!

My main.tex file

..................
\begin{document}


\chapter{chapter1}
\label{sec:Ch1}
\input{chapter1}


\chapter{chapter2}
\label{sec:Ch2}
\input{chapter2}

.................
\end{document}

and I want to reference Chapter 1 (chapter1.tex) to Chapter 2(chapter2.tex), the typical Chapter~\ref ...