Error message on cart page

3 days ago Easyship WooCommerce Shipping Rates works perfect on my client site but form today it shows me the bellow error message, how can it be fixed.

Warning: unserialize() expects parameter 1 to be string, array given in /home/veganpos/public_html/theteaequation.com/wp-content/plugins/easyship-woocommerce-shipping-rates/includes/easyship-shipping.php on line 367

Thanks

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