PDOE-Error after upgrade from 6.26 to 7.16

Hi,
after upgrading from 6.26 to 7.16 I tried to activate Simplenews and got the following error:

PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'db214620035.simplenews_category' doesn't exist: SELECT sc.*, t.name AS name, t.description AS description, t.weight AS weight, t.vid AS vid FROM {simplenews_category} sc LEFT OUTER JOIN {taxonomy_term_data} t ON t.tid = sc.tid WHERE (block = :db_condition_placeholder_0) AND (opt_inout <> :db_condition_placeholder_1) ORDER BY t.weight ASC; Array ( [:db_condition_placeholder_0] => 1 [:db_condition_placeholder_1] => hidden ) in simplenews_categories_load_multiple() (Zeile 1863 von /sites/all/modules/simplenews/simplenews.module).

Any idea?
Do you need more information?