Classicthesis Short title not appear in Table of COntent in Lyx

What steps will reproduce the problem?
1. Long chapter title for headings. I need to use a short title but this short title
is used in the TOC.
 I use titlesec package in the Latex preamble in Lyx but I get an error message from
Lyx:

Latex error: Option clash for  package titlesec. Use of \@chapter doesn´t match its
definition.

Is there any othe way to short title in "classicthesis" in LYX and Long Chapter title
appear in TOC.


I would appreciate any help.

Thanks

Original issue reported on code.google.com by YURENA.ME.LE on 2014-12-09 21:15:24

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