click app in admin, get "Integrity constraint violation"

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'public://apps/webform_screenshot_7.png' for key 'uri': UPDATE {file_managed} SET uid=:db_update_placeholder_0, filename=:db_update_placeholder_1, uri=:db_update_placeholder_2, filemime=:db_update_placeholder_3, filesize=:db_update_placeholder_4, status=:db_update_placeholder_5, timestamp=:db_update_placeholder_6 WHERE (fid = :db_condition_placeholder_0) ; Array ( [:db_update_placeholder_0] => 1 [:db_update_placeholder_1] => webform_screenshot.png [:db_update_placeholder_2] => public://apps/webform_screenshot_7.png [:db_update_placeholder_3] => image/png [:db_update_placeholder_4] => 7390 [:db_update_placeholder_5] => 1 [:db_update_placeholder_6] => 1362174356 [:db_condition_placeholder_0] => 34 ) in drupal_write_record() (regel 7013 van /home/mammetim/domains/mam-me-time.be/public_html/test/openenterprise/includes/common.inc).

I have no clue what this means, I am trying open enterprise for the first time.... only made one drupal site before, nothing special, more like 'out of the box' stuff...