I compile the following source without any problem:
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\documentclass[12pt,titlepage]{report}%\usepackage{ucs} % unicode support%\usepackage[utf8x]{inputenc}%\usepackage[english,hebrew]{babel}\usepackage[mathscr]{euscript}\usepackage{mathrsfs}\usepackage{mathtools, amsmath,amsthm, amssymb,latexsym,amsfonts}\newtheorem{theorem}{Theorem}[chapter]\begin{document}\begin{theorem}kkkkk\end{theorem}\end{document}