just the same happened to me. I have SS v2.3.0-rc2 running and I get the same error when trying to inst ecommerce.
Fatal error: Class 'Email_Template' not found in /srv/www/myserver.de/sis/ecommerce/code/Order.php on line 1142
Any help?
Chris
added 27th Dec.: It even shot my SS installation. When I call the start page I get now:
[User Error] Couldn't run query: SELECT `SiteTree`.*, `GhostPage`.*, `CheckoutPage`.*, `Product`.*, `ErrorPage`.*, `RedirectorPage`.*, `VirtualPage`.*, `SiteTree`.ID, if(`SiteTree`.ClassName,`SiteTree`.ClassName,'SiteTree') AS RecordClassName FROM `SiteTree` LEFT JOIN `GhostPage` ON `GhostPage`.ID = `SiteTree`.ID LEFT JOIN `CheckoutPage` ON `CheckoutPage`.ID = `SiteTree`.ID LEFT JOIN `Product` ON `Product`.ID = `SiteTree`.ID LEFT JOIN `ErrorPage` ON `ErrorPage`.ID = `SiteTree`.ID LEFT JOIN `RedirectorPage` ON `RedirectorPage`.ID = `SiteTree`.ID LEFT JOIN `VirtualPage` ON `VirtualPage`.ID = `SiteTree`.ID WHERE (HomepageForDomain REGEXP '(, ^) *mysite\.de *(,|$)') ORDER BY Sort LIMIT 1 | Table 'ss.CheckoutPage' doesn't exist
GET /sis/
Line 394 in /srv/www/mysite.de/public_html/sis/sapphire/core/model/MySQLDatabase.php