Hi
the error happens when the installer cannot run struct.sql script.
So the solution can be to
first: runt the script manually, using phpmyadmin or so. (do not forget to edit the script and replace /*TABLE_PREFIX*/ with your table prefix. defalut is oc_)
second: in OSCFacebook.php around line 139 remark the following lines:
if( !$this->dao->importSQL( $sql ) ) {
throw new Exception( __('Error importing the database structure of the jobboard plugin', 'jobboard') );
}
It worked for me!