Error when deleting Tier Pricing Table Plugin

I wanted to delete Tier Pricing Table Plugin because I don’t need it anymore. The problem is that even if I delete all the files related to this plugin, I got the following error message when I try to add an item to cart. I don’t know what to do to fix this. Can someone help me ?

Fatal error: Uncaught Error: The script tried to modify a property on an incomplete object. Please ensure that the class definition “TierPricingTable\PricingRule” of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide an autoloader to load the class definition in /var/www/html/wp-includes/formatting.php:5131 Stack trace: #0 /var/www/html/wp-includes/formatting.php(5126): map_deep(Object(__PHP_Incomplete_Class), ‘stripslashes_fr…’) #1 /var/www/html/wp-includes/formatting.php(5126): map_deep(Array, ‘stripslashes_fr…’) #2 /var/www/html/wp-includes/formatting.php(5126): map_deep(Array, ‘stripslashes_fr…’) #3 /var/www/html/wp-includes/formatting.php(2851): map_deep(Array, ‘stripslashes_fr…’) #4 /var/www/html/wp-includes/formatting.php(5784): stripslashes_deep(Array) #5 /var/www/html/wp-includes/meta.php(208): wp_unslash(Array) #6 /var/www/html/wp-includes/user.php(1198): update_metadata(‘user’, 1, ‘_woocommerce_pe…’, Array, ”) #7 /var/www/html/wp-content/plugins/woocommerce/includes/class-wc-cart-session.php(301): update_user_meta(1, ‘_woocommerce_pe…’, Array) #8 /var/www/html/wp-includes/class-wp-hook.php(312): WC_Cart_Session->persistent_cart_update(‘693aaca9e8b1bf0…’) #9 /var/www/html/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(”, Array) #10 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #11 /var/www/html/wp-content/plugins/woocommerce/includes/class-wc-cart.php(1286): do_action(‘woocommerce_add…’, ‘693aaca9e8b1bf0…’, 113, 1, 116, Array, Array) #12 /var/www/html/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(928): WC_Cart->add_to_cart(113, 1, 116, Array) #13 /var/www/html/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(800): WC_Form_Handler::add_to_cart_handler_variable(113) #14 /var/www/html/wp-includes/class-wp-hook.php(310): WC_Form_Handler::add_to_cart_action(”) #15 /var/www/html/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(NULL, Array) #16 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #17 /var/www/html/wp-settings.php(654): do_action(‘wp_loaded’) #18 /var/www/html/wp-config.php(99): require_once(‘/var/www/html/w…’) #19 /var/www/html/wp-load.php(50): require_once(‘/var/www/html/w…’) #20 /var/www/html/wp-blog-header.php(13): require_once(‘/var/www/html/w…’) #21 /var/www/html/index.php(17): require(‘/var/www/html/w…’) #22 {main} thrown in /var/www/html/wp-includes/formatting.php on line 5131