We're running Joomla 3.6.2 and CiviCRM 4.7.11, however we recently made some adjustments that prompted us to uninstall the Summary Fields extension. Essentially, it was installed in a different directory than the default settings. We reset the paths and that cause problems. So, we uninstalled and reinstalled, so extensions are now in the default directory. The problem is that when we configure summary fields and set it to update "when the form" is submitted, we receive the error "Error adding custom field 'contribution_amount_last': DB Error: already exists" (same error for other fields as well, like "last donated", etc.). Is there a way to do a complete uninstall of this, or is there a better way to handle this error?