LaTex error : ! LaTeX Error: Command \ecircumflex unavailable in encoding T1

Question

I get a trouble in compiling LaTex. I used Texlive and Texmaker(in Xubuntu 13.04) for writing LaTex, the error says : LaTeX Error: Command \ecircumflex unavailable in encoding T1.

note that in window XP, with Miktex and Texmaker, the following MWE worked correctly.

Here is a minimal working example :

\documentclass[graybox,envcountsec,sectrefs,vecarrow,envcountretsec]{svmono}
\usepackage[utf8]{vietnam}
\usepackage[utf8]{inputenc}
\usepackage{savesym}
\usepackage{mathptmx}
\savesymbol{hbar}
\usepackage{helvet}
\usepackage{courier}
\usepackage{type1cm}
\usepackage{fourier}
\usepackage{esvect}
\begin{document}
Tiếng Việt không hiển thị được(i.e: Can not display vietnamese character correctly): $\widearc{AB}, \wideOarc{AB}$ ?
\end{document}

So, how can I fix this error ?

Answer 1

The fourier package does

\RequirePackage[T1]{fontenc}

so T1 becomes the default encoding. Just do

\usepackage{fourier}
\usepackage[T5]{fontenc}

so the default encoding will be T5 (Vietnamese).

I find it quite strange all the font juggling you do; surely loading type1cm is useless. Also loading mathptmx and doing \savesymbol{\hbar} does nothing, because the Fourier fonts have their own \hbar symbol.

\documentclass[graybox,envcountsec,sectrefs,vecarrow,envcountretsec]{svmono}

\usepackage[utf8]{vietnam}
\usepackage[utf8]{inputenc}

\usepackage{helvet}      % Helvetica for sans serif
\usepackage{courier}     % Courier for monospaced

\usepackage{fourier}     % Utopia for the main font
\usepackage[T5]{fontenc} % restore the Vietnamese encoding

\usepackage{esvect}

\begin{document}

Tiếng Việt không hiển thị được(i.e: Can not display vietnamese 
character correctly): $\widearc{AB}, \wideOarc{AB}$?

\end{document}

Answer 2

Fortunately, I solved this question myself, but I still do knot know what is the real mistake that led to that error :

\documentclass[graybox,envcountsec,sectrefs,vecarrow,envcountretsec]{svmono}
\usepackage[utf8]{vietnam}
\usepackage[utf8]{inputenc}
\usepackage[vietnamese]{babel}
\usepackage{savesym}
\usepackage{mathptmx}
\savesymbol{hbar}
\usepackage{helvet}
\usepackage{courier}
\usepackage{type1cm}
\usepackage{fouriernc}
\usepackage{esvect}
\begin{document}
Thế bác Điển nói gì về lỗi này : $\widearc{AB}, \wideOarc{AB}$ ?
\end{document}

If you know where the error (of the first MWE in my question) in fact came from, please tell me. Thank so much :)