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Thanks frabjous,

You are right, i was doing mistake in apostrophes. Now it resolved my problem. Thanks again for your kind help.

Regards,
Atif

I am facing a problem related to words of german language in my document.

Like i wants to add this writer name in my document "Klüppelberg"

for "ü" i am using "\''u " like "Kl\''uppelberg" and added these packages

\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage{multirow ...