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Child themes can be a bit difficult but the basic setup is really easy.All WordPress themes work the same way, if you need to change colors, position elements differently and generally mod the theme,...

marcavage

1.the Vantage banner is for a 468x60 ad, you can use bigger but you need to adjust your css.
2.to create your menus use WP>Appearance>Menus.
3.you can find more information about child...

There seems to be two separate questions-

1- Error message. It may have to do more with your hosting setup then the theme. I have installed 4 versions of the theme and not once had that issue...