When i add this line to the skin:

<dnn:MENU id="nameMenu" MenuStyle="Simple" runat="Server"/>

the div where the line is, shows this:

"An error has occurred. An error has occurred."

The rest of the skin is ok. I registered the control in the skin like this:

<%@ Register TagPrefix="dnn" TagName="MENU" src="~/DesktopModules/DDRMenu/Menu.ascx" %>

This is a new instalation, i only have changed the skins

Do you have a directory names Simple in your skin directory? If not, copy that directory from the Gravity skin package.

When you like a menu style, DDR menu looks for it in the directory holding the skin file. If it's not there, DDR menu will look in the DesktopModules\DDR Menu folder, where you'll find DNNMenu, DumpXML and Solpart. If you like, you can place the standard DNN templates there, or you can put your own templates there. For custom templates, I prefer to put them in the skin's folder instead.