Hello Prageeth,
Somehow this table is missing from your installation.
However, to resolve this go to your database and run the query.
CREATE TABLE IF NOT EXISTS `#__sellacious_shipping_freerule` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `rule_id` int(11) NOT NULL,
  `amount_min` double NOT NULL,
  `amount_max` double NOT NULL,
  `state` tinyint(1) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
Note: Replace #_ with the table prefix of your database.
I hope this helps.
Thank You