Error message trying to access Apps after install of blog

I received this error message after what I believe was an unsuccessful installation of the blog app. Any idea how I can fix this issue?

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'public://apps/webform_screenshot_4.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_4.png [:db_update_placeholder_3] => image/png [:db_update_placeholder_4] => 7390 [:db_update_placeholder_5] => 1 [:db_update_placeholder_6] => 1346975969 [:db_condition_placeholder_0] => 113 ) in drupal_write_record() (line 7036 of /home/mysite/public_html/includes/common.inc).
The website encountered an unexpected error. Please try again later.

I also receive this message when I go to Admin>Apps>LevelTenApps>Installed Apps

Warning message
There was the following error - SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'public://apps/webform_screenshot_7.png' for key 'uri'