[eledmac] Reledpar: "The left page has ended on a right page"

[<wiewiorka2004-varia@xxxxxxxx>]

I have a strange mistake in compilation process, whose result is the message: "The left page has ended on a right page". It is referred to line number... but this number is related to the master document, to an \include instance. I get this error message when i add a determinated piece of text... The strange fact is that this fragment is coded exactly like the prior and subsequents fragments, which don't cause any problem. So it is clear that the origin of this situation is this text... but I don't know why, for this piece is almost identical to the others. 

Have you please any idea abot the cuase of this poblem? 

Thanks in advance,

Josep

PS:

Here you have the code. The context is a translation with original text / translated text faced in diferent pages:

vspace*{2cm}

\begin{pages}

\begin{Leftside}

\selectlanguage{polish}

%\date{}

\begin{Leftside}

\begin{center}

\textbf{\textit{\huge{Bla, bla, bla}}}

\end{center}

\end{Leftside}

\beginnumbering

\stanza[\textbf{Bla, bla, bla}\vspace*{0.25cm}]

Bla, bla, bla&

Bla, bla, bla.\&[\vspace*{-0.25cm}]

\stanza

Bla, bla, bla&

bla, bla, bla.\&[\vspace*{-0.25cm}]

\stanza

Bla, bla, bla&

bla, bla bla.\&[\vspace*{0.50cm}\\]   

\endnumbering

\end{Leftside}

\begin{Rightside}

\selectlanguage{catalan}

\begin{Rightside}

\begin{center}

\textbf{\textit{\huge{Vent}}}

\end{center}

\end{Rightside}

\beginnumbering

\stanza[\textbf{Bla, bla, bla}\vspace*{0.25cm}]
Bla, bla, bla&
Bla, bla, bla.\&[\vspace*{-0.25cm}]
\stanza
Bla, bla, bla&
bla, bla, bla.\&[\vspace*{-0.25cm}]
\stanza
Bla, bla, bla&
bla, bla bla.\&[\vspace*{0.50cm}\\]   




\endnumbering
\end{Rightside}
\end{pages}





\Pages

In the master document, I have:

\documentclass[12pt,a4paper,twoside]{book}
%Comment the following to have chapters numbered without interruption (numbering through parts)
%\makeatletter\@addtoreset{chapter}{part}\makeatother%
\usepackage{polyglossia,fontspec,xunicode}
\usepackage{libertine}
\setmainlanguage{catalan}
\setotherlanguage{polish}
\usepackage{reledmac}
\usepackage[shiftedpstarts]{reledpar}
\sethangingsymbol{[\,}
\setstanzaindents{7,0}
\setcounter{stanzaindentsrepetition}{1}
\numberlinefalse 
\usepackage[pagestyles,outermarks,clearempty]{titlesec}
\usepackage[hidelinks]{hyperref}
\usepackage{url}
\usepackage{endnotes}
\usepackage{csquotes}
\usepackage{microtype}
\usepackage[pagestyles,outermarks,clearempty]{titlesec}
\titleformat{\chapter}[display]
{\normalfont\Large\filcenter\bfseries}
{\titlerule[1pt]
\vspace{1pt}
\titlerule
\vspace{1pc}
\LARGE\MakeUppercase{\chaptertitlename} \thechapter}
{1pc}
{\titlerule
\vspace{1pc}
\Huge}
\usepackage{titletoc}
\titlelabel{\thetitle.-\thinspace}
\usepackage[inner=5cm,outer=3cm,tmargin=3cm,bmargin=3cm]{geometry}
\raggedbottom
\usepackage{calc}
\usepackage{fancybox}
\usepackage{fancyhdr}
\pagestyle{myheadings}
\markboth{Bla, bla, bla}{Bla, bla, bla}
\renewcommand{\thesection}{\arabic{section}}
\clubpenalty=10000
\widowpenalty=10000

\begin{document}
\maketitle

\include{Bla, bla, bla}

%etc...
\end{document}