500 - JHtmlBehavior::mootools not found.
Version 2.0 of JoomGallery (and probably later versions until they fix it) for Joomla 3 calls mootools, which is non-existant. You can correct this, but they will probably update the extension and not fix it (maybe not, but who knows). So, until they've definitely fixed it, I would download this little plugin that does nothing else other than fix a bug that is common with J3 extensions...J25 Legacy Plugin
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