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You're welcome!
Actually searching for that error I found this on a forum:
"It has nothing to do with the specific table used but the fact that the table may contain math characters or somehow messes with the way LyX deals with math characters inside tex code."
So I thought that using a package ...

Hi,
try put this in the preamble:

It's perfect like this, thanks a lot!

Thanks, LyX generate:

%% LyX 2.2.2 created this file. For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\documentclass[12pt,twoside,italian]{article}
\usepackage[T1]{fontenc}
\usepackage[a4paper]{geometry}
\geometry{verbose,tmargin=25mm,bmargin=25mm ...

I tried the memoir and I have the same problem, put this in the Preamble:

\setstocksize{297mm}{210mm}

it worked for me.

Hi,
LyX automatically use the package geometry \usepackage[a4paper]{geometry} ) I think you put a \usepackage{geometry} in your Preamble that reset the LyX setting and put the page back to the default style (the default style for memoir is letterpaper).
If you need to change the geometry of a page ...

I made a little file showing what I want to do, hope it help understanding the problem.
The conflict appear when I put in the Preamble \usepackage{caption}, so if you put that in the Preamble of my file I think you'll get the same problem.
Thanks

Which version of LyX do you use?
I'm working with 2.2.2 and in Document->Settings->Modules you can enable numbering equation, figure,tables by sections, just search in Modules and there's a little description, without having to use other package, but I don't know if this is implemented in other ...

Thanks everyone,
the package subcaption is in conflict with the package subfigure that is automatically used by LyX and I don't know how to remove it.
With the package subfig I have the exact problem that i described, maybe it is because I use the insert Image and Insert Label of Lyx instead of ...

Hi, I'm new in the forum. I'm writing my thesis using LyX, v. 2.2.2, and I've got a problem with subfigures.
I'd like to recall the label in the description of the Figure like (a) and (b), but using the cross reference I have 1(a) and 1(b); instead in the text I want exactly 1(a) and 1(b). Like ...