WordPress database error: [Can't DROP 'application'; check that column/key exists]
ALTER TABLE wp_nextend2_section_storage DROP INDEX `application`

WordPress database error: [Can't DROP 'thumbnail'; check that column/key exists]
ALTER TABLE wp_nextend2_smartslider3_slides DROP INDEX `thumbnail`

WordPress database error: [Duplicate key name 'thumbnail']
ALTER TABLE wp_nextend2_smartslider3_slides ADD INDEX `thumbnail` (`thumbnail`(100))