Hi,
I have searched but can't find this error:
Validation Error: URL to your Gallery2 is Missing.
AND this:
WPG2 plugin cannot locate the Gallery2 installation.
Upon activation, WPG2 automatically looks for your Gallery2 installation in (Domain URL)/gallery2/, (Domain URL)/gallery/, (Domain URL)/photos/, (WordPress URL)/gallery2/, (WordPress URL)/gallery/, and (WordPress URL)/photos/. If your Gallery2 installation is in another directory, please go to the "WPG2 Paths" tab and enter your Gallery2 URL. embed.php
Warning: Using the Simple Header
WPG2 will generate your Wordpress header using the CSS Elements specified in the embedded page options. For some Wordpress themes this will incorrectly distort the output from Gallery2 and instead you may need to create your own WPG2 Header.
Posts: 1378
Please have a read of the following Documentation -> http://codex.gallery2.org/Integration:WPG2_Options_-_G2_Paths. Please supply the URL to your Gallery2 as per the Automatic Validation instructions..
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Wordpress / Gallery2 (WPG2) Plugin, WPG2 Downloads, WPG2 Documentation