It looks like you either have an old version or attempted to update from an older version. It would be easiest for you to just wipe out your ubercart directory and reinstall it from Drupal.org, but if you've customized stuff in there you need to look in the payment and shipping subdirectories to see a list of directories that were moved in there and then delete them from the ubercart root directory. (In other words, you should keep /payment/uc_credit and get rid of /uc_credit.)