Hi,
Ok this is another thing. This error usually happens because your database table #__cck_core_fields is missing the language column. The installer tries to run an INSERT that includes language, but MySQL can’t find that column, so it fails.
Most of the time this comes from a previous failed / partial install (or an old leftover SEBLOD schema) where the table got created but the later ALTER TABLE steps didn’t finish.
You can fix it in two ways:
1. Add the missing column
ALTER TABLE `#__cck_core_fields` ADD COLUMN `language` CHAR(7) NOT NULL DEFAULT '*';
2. Clean up the half-created SEBLOD tables and reinstall (cleanest approach if you don’t need existing SEBLOD data): remove the #__cck_* tables (or at least #__cck_core_fields) and run the install again.
Note that you must replace #__ with your real Joomla table prefix.
Best regards.
Adonay