cannot instantiate non-existent class: modules_forum_publish

[JosepC]

Hi:
When I try to publish my Site, some simlars errors occurs depending on the pages I have on the site:

1) If the are foruns defined, the error is:
Message Invalid server response: c1

fatal error: cannot instantiate non-existent class: modules_forum_publish in /xxx/include/sb/modules/publicationexecutor.php on line 362

2) if they are eshop included, the error is:
Message Invalid server response: c1

fatal error: cannot instantiate non-existent class: modules_eshop_publish in /xxx/include/sb/modules/publicationexecutor.php on line 362

3) If they are blogs defined, the error is:
Message Invalid server response: c3

fatal error: cannot instantiate non-existent class: modules_blogger_publish in /xxx/include/sb/modules/publicationexecutor.php on line 362

More info: In directory /xxx/include/Modules, they are the files: Blogger.php, Eshop.php and Forum.php. Also the are the directories: Blogger, Eshop and Forum

Any idea?
Thanks